electrochemistry handbook - fisher scientific - lab supplies scientific accumet... ·...

electrochemistry handbook

high-quality, user-friendly and cost-effective instruments for every application and budget!

Fisher Scientific puts more into its electrochemical instrument line – so you can get more out of itAs always, Fisher ScientificTM strives to bring you a comprehensive selection of the best laboratory products available. Our updated and expanded selection of electrochemical products features high quality, user-friendly and cost-effective instruments for every application and budget.

The instruments are the state of the art for measuring pH, mV (ORP), ion concentration, conductivity, total dissolved solids (TDS), dissolved oxygen, and temperature. Most of these instruments measure several parameters. The selection guides inside ensure you have the information to make the best choice for your requirements.

What is Electrochemistry?The science dealing with the chemical action of electricity and the production of electricity by chemical reactions. ~ wordnetweb.princeton.edu/perl/webwn ~

AB150 (Page13)

13-620-BSP Stirrer (Page 17)XL600

(Page 8)

13-620-632 accuTupH pH/ATC

electrode (6)

AP125 (Page 18)

Innovative new products, extensive product offeringFisher ScientificTM accumetTM XL benchtop meters bring advanced features with simplicity to your laboratory. The color touch screen is stunningly vivid and is sure to make a great first impression that doesn’t stop. Some newly added features include two stirring probe ports, a 3-position electrode holder, upgradeable software, and USB & RS232 connectivity. We’ve priced these new meters competitively, so these advanced XL meters have never been more affordable.

Fisher Scientific accumet AB benchtop meters have been the top selling pH meter year after year. That was before we added backlight, multiple views, date/time for GLP requirements, expanded memory, custom buffer calibration options, a calibration alarm, 3-position electrode holder, stirring capability, upgradeable software, and wall-mounting to name a few new features. We have added two new models – the AB250 with ISE capability, and the AB200, our first AB multi-parameter instrument for pH & conductivity. AB basic meters offer great accuracies, simplified performance, and many popular features at an economical price and are poised to continue their success as the top selling pH meter for years to come.

Fisher Scientific accumet waterproof portable meters are the choice of demanding professionals who require rugged, dependable, and feature-rich instruments. These IP67-rated meters deliver exceptional performance and versatility as well as customizable calibration, setup, and measurement capabilities.

Fisher Scientific accumet electrodes meet almost any application. Innovative products like Fisher ScientificTM accuCapTM, accu•pHastTM R electrodes, and accuTupHTM XL probes improve performance in tough applications.

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C o n t e n t s

The pH Mechanic – We will keep your lab running smoothly.

Our electrochemistry experts throughout North America will perform a free 18 point inspection of your pH meter and electrodes. Like a trusted mechanic they will diagnose your instruments and recommend parts you need including; calibration settings, electrode check, buffer selection, and more! Subject to availability. To schedule a pH mechanic, contact your Fisher Scientific Sales Representative.

Need more information? Visit www.fishersci.com/accumet for manuals, free communication software, warranty registration, and much more 24/7!

Benchtop Meters PageFisher Scientific accumet XL & AB overview and index.................................................................. 4Fisher Scientific accumet XL Series Benchtop Meters................................................................... 6Fisher Scientific accumet XL600 pH/mV/Temp/ISE/DO/Conductivity Meter................................. 8Fisher Scientific accumet XL500 pH/mV/Temp/ISE/Conductivity Meter........................................ 10Fisher Scientific accumet XL200 pH/mV/Temp/Conductivity Meter............................................... 11Fisher Scientific accumet XL250 pH/mV/Temp/ISE Meter............................................................... 12Fisher Scientific accumet XL150 pH/mV/Temp Meter...................................................................... 13

Fisher Scientific accumet AB250 pH/mV/ISE/Temp Meter............................................................... 14Fisher Scientific accumet AB150 pH/mV/Temp Meter...................................................................... 15Fisher Scientific accumet AB200 pH/Conductivity/Temp Meter..................................................... 16Fisher Scientific accumet Benchtop Stirring Probe......................................................................... 17

Portable MetersFisher Scientific accumet AP110, AP115 And AP125 Meters.......................................................... 18Fisher Scientific accumet AP71 And AP72 Meters........................................................................... 19Fisher Scientific accumet AP85 And AP75 Meters........................................................................... 20Fisher Scientific accumet AP84 And AP74 Meters........................................................................... 21

ElectrodesFisher Scientific accumet Electrodes................................................................................................. 22Fisher Scientific accumet pH Electrodes........................................................................................... 24Fisher Scientific accumet pH And Half Cell Electrodes................................................................... 29Fisher Scientific accumet Electrodes................................................................................................. 30Fisher Scientific accumet Half Cell And ORP Electrodes................................................................ 31Fisher Scientific accumet Ion-Selective Electrodes (ISE)............................................................... 32

Probes, And AccessoriesFisher Scientific accumet Conductivity, Dissolved Oxygen And Temperature Probes................................................................................................................................ 34

Accessories/Cables/Printers................................................................................................................. 35Certified Buffer Solutions...................................................................................................................... 36

Technical InformationAbout pH, ORP, And ISE Measurement............................................................................................... 38Testing/Care/Troubleshooting............................................................................................................... 40About Conductivity Measurement........................................................................................................ 42About Dissolved Oxygen Measurement............................................................................................. 44

Index 46InnoCal Calibration Services and Certified Fisher Scientific accumet Meters 47

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www.fishersci.com/accumet

Our most popular instruments are now better than ever!

Fisher Scientific strives to bring you a comprehensive selection of the best laboratory products available. Our updated and expanded selection of electrochemistry products offer high quality, user-friendly and cost-effective instruments for every application and budget.

Fisher Scientific accumet was the first to market a touch screen pH meter in 1998 with the AR series, and led the way by introducing the world’s first color touch screen pH meter 2003 with the XL series. Our latest Fisher Scientific accumet AB and XL benchtop series once again represent large strides in the world of electrochemistry and stay true to their reputation for having simple-to-understand interfaces.

Whether you are measuring pH, mV (ORP), ion selective concentration, conductivity, total dissolved solids (TDS), dissolved oxygen, temperature, or all of the above, Fisher Scientific accumet has been offering the products you need since 1965. For more information, contact our Fisher Scientific sales representatives around the globe or visit www.fishersci.com.

AB150 Bench Meter (Page 15)

XL600 Bench Meter (Pages 8)

Fisher Scientific accumetHigh-Quality, Feature-Rich, & User-Friendly Instruments!

Fisher Scientific accumet XL & AB Meter Series

Model XL600 XL500 XL250 XL200 XL150 AB200 AB250 AB150

Page 8 10 12 11 13 16 14 15

Color Touch Screen 4 4 4 4 4

pH-mV (BNC) / Temp 44 44 44 4 4 4 4 4

Ion Selective-mV (BNC) / Temp 44 44 44 4

Conductivity / TDS / Resistivity / Salinity / Temp 4 4 4 4

Dissolved Oxygen / Temp 4

Stirring Probe 44 44 44 44 4 4 4 4

USB Device / RS-232 4 4 4 4 4 4 4 4

USB Host / RS-232 / RJ-45 (Ethernet) 4 4 4 4 4

44 = Dual Channel Capacity

4

New AB backlit graphic display is capable of showing detailed or basic

info with a press of a button.

Detailed InfoBasic Info

Internet Access

Custom Settings

Multi-Channel Measurement

Simple Setup Screens

New TFT color touch screen

display provides outstanding clarity

New 100-240 V Power Supply included with every AB and XL model includes multi-plugs for use around the globe.

Fisher Scientific accumet XLIt’s all just a touch away...

New Benchtop Stirring Probe for use with AB or XL series (Page 35)

Fisher Scientific accumet ABBetter than ever!

New Compact Printer (Cat. No. 13-637-690) available for direct printing from AB150, AB200, AB250, XL150, XL200, XL250, XL500, or XL600 meters. Includes paper and 100-240 V with 4 plug types for global use.

New 13-637-692 Fisher Scientific Optical USB Mouse for use with any XL series meter. Control your XL meter without touching the screen, or use with your laptop or PC.

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Fisher Scientific accumet XL Series Benchtop MetersInstruments With Features That Will Improve Productivity In Any Laboratory

» Extensive setup screens allow customized settings to meet your specific needs

» 3-year instrument warranty; register at fishersci.com/accumet

» Crowded lab bench space? Take advantage of the wall-mounting back panel

» Do you share your meter with other departments or colleagues? Don’t compromise! XL meters allow you to create up to 10 password protected ID’s; each includes memory to store 2000 data points - per parameter! Base ID’s on individual users, applications, or projects to keep data separate, and retain unique calibration and instrument settings

» TFT color LCD provides crystal clear data from wide viewing angles and at a distance

» Improved touch screen with glass/glass sensitivity

» Connect one or two stirring probes; provides mixing without stir plates!

» Bidirectional communication for LIMS connectivity

» USB connectivity for use with keyboard, mouse, or other USB device

» Upgradable application software

» RJ45 Ethernet/Internet port – connect to Local Area Network (LAN) or Internet, print data to a network printer or surf the web

» Calibrate with custom buffer values or automatically using one of five preset buffer groups

» User prompts and context-specific “help” screens guide you through operation

Removable electrode arm can be mounted on either side of the meter,

or add a second arm to facilitate multi-probe operation.

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Instruments With Features That Will Improve Productivity In Any Laboratory

Rear View of XL600

Choose the minimum or maximum number of channels to display:

POWER: Power supply, 100/240 VAC, 9 VDC, 18W, center positive. Use only model 13-636-104 (included)

STIRRER A: For use with optional stirring probe (13-620-BSP)

DO: 8-pin DIN connection for 13-620-SSP Self-Stirring Dissolved Oxygen/Temperature electrode. Note: Model XL600 only

TEMP: Automatic Temperature Compensation probe (13-620-19) and pH electrodes that also include ATC. Note: Models XL250, XL500, & XL600 have Dual BNC Channels, each with Temperature

2/4 CELL: 8-pin DIN connection for 2-cell or 4-cell Cond/TDS/Resistivity/Salinity/Temperature electrodes. Note: Models XL200, XL500, XL600 only

BNC: For combination pH, mV (ORP, Redox), or Ion Selective Electrodes (ISE). Note: Models XL250, XL500, & XL600 have Dual BNC Channels, each with Temperature

RJ45: Ethernet port for network/ internet connectivity

STIRRER B: For use with optional stirring probe (13-620-BSP)

Left

RS-232: RS-232 serial

communication output, 2.5 mm

jack. For use with RS-232 cable

13-637-681 (included)

Right

MINI-B USB: USB communication

for field software upgrades (cable

included) and data output

GROUND: For electrical grounding/electrical noise reduction

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A complete lab in one instrument. Our top-of-the-line, research-grade touch screen meter measures and displays up to four channels! Unit features two pH/mV/ISE inputs along with one conductivity input (2-cell or 4-cell), as well as one dissolved oxygen input.

» Customize the XL600 to display 1, 2, 3 or 4 active measurements simultaneously – each with temperature! Channel 1 : pH, mV, or Ion Selective Channel 2 : pH, mV, or Ion Selective Channel 3 : Conductivity, TDS, Resistivity, or Salinity Channel 4 : Dissolved Oxygen/ BOD/OUR/SOUR

» Real-time graph provides outstanding detail of any parameter

» DO mode calculates five-day BOD

Quite simply if you want the best, this is the instrument to put in your lab. Ask your Fisher Scientific representative how you can make your colleagues jealous with accumet, or visit www.fishersci.com/accumet.

“XL600 Deluxe” kit includes these electrodes.For ion selective electrodes (ISE), see page 34.

13-620-183A

13-620-19

13-620-100

13-620-SSP

For best results, connect optional 13-620-BSP stirrer (see page 13) for efficient mixing and fast, accurate measurements!

Quite Possibly The World’s Best Meter

Fisher Scientific accumet XL600 pH/mV/Temp/ISE/DO/Conductivity Meter

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pHRange ResolutionAccuracyCal. Points Buffer Sets

Slope DisplayMultiple Slope DisplayTemp CompensationTemp Range (Meter)Inputs

-2.000 to 20.000 0.1/0.01/0.001 selectable±0.1/0.01/0.002 ±1 LSD Up to 6 preset or 5 custom• USA: 2.000, 4.010, 6.997, 10.013, 12.000• NIST: 1.678, 4.010, 6.865, 9.184, 12.460• DIN: 1.090, 3.060, 4.650, 6.790, 9.230, 12.750• FSCI: 1.000, 3.000, 6.000, 8.000, 10.000, 13.000• CUSTOM: Any 2-5 values, ≥1.0 pH unit apartYes, with offsetYes, up to 5 different slopesAutomatic or manual (0 to 100 ºC / 32 to 212 ºF)0.0 to 100.0 ºC / 32.0 to 212.0 ºFBNC, ATC

mVRangeRel. mV RangeResolutionAccuracy Offset Adjustment

±2000.0 mV±2000.0 mV0.1 mV ±0.2 mV or ±0.05 % whichever is greater Up to ±150 mV

IonRangeResolutionUnitsAccuracy

Cal Points

0.001 to 19999 (±2000 mV)0.001 / 0.01 / 0.1 / 1 (automatic)ppm, mg/L, molar0.5 % full scale (monovalent ion)1 % full scale (divalent ion)2 to 6 points from one of following groups; • 0.001, 0.01, 0.1, 1, 10, 100• 0.01, 0.1, 1, 10, 100, 1000• 0.02, 0.2, 2, 20, 200, 2000• 0.1, 1, 10, 100, 1000, 10000• 0.05, 0.5, 5, 50, 500, 5000

Temperature

ResolutionAccuracyCalibration

0.1 ºC / 0.1 ºF±0.3 ºC / ±0.5 ºFOffset in 0.1 º increments; Offset range: ±5 ºC / 9 ºF

Conductivity RangeResolutionAccuracyCal. Points

Cell ConstantCell TypesCoefficient (Per ºC)NormalizationCompensationTemp Compensation

0.00 µS to 500.0 mS0.01 / 0.1 µS; 0.001 / 0.01 / 0.1 mS±1 % full scaleAutomatic (4 points); maximum 1 per rangeManual (5 points); maximum 1 per range 0.010 to 10.0002 or 4 cell with ATCLinear & pure; adjustable 0.000 to 10.000 %15.0 to 30.0 ºC / 59.0 to 86.0 ºFAutomatic with supplied cell or manual0.0 to 100 ºC / 32.0 to 212.0 ºF (0.0 to 80 ºC / 32.0 to 176.0 ºF with supplied cell)

TDSRangeResolutionAccuracyCal. Points TDS Factor

0.00 ppm to 500 ppt (@ TDS factor 1.00)0.01 / 0.1 ppm ; 0.001 / 0.01 / 0.1 ppt±1 % full scaleUp to 50.400 to 1.000

Salinity RangeResolutionAccuracy

0 to 80.0 ppt0.01 / 0.1 ppm; 0.001 / 0.01 / 0.1 ppt±1 % full scale

Resistivity

RangeResolutionAccuracy

2.000 Ω to 20.0 MΩ0.01 / 0.1 Ω; 0.001 / 0.1 kΩ; 0.01 MΩ±1 % full scale

OtherDisplayOutputAdjustable Stirrer Speed

Language selection

Memory

Datalogging

Cal Due AlarmHigh / Low Alarms

Power

Color TFT Touchscreen, 130 x 100mm (active area)RJ45, RS232, USB-A, mini-B USB, stirrer port (2) Yes. Each XL can accept (2) stirrers with individual speed control English, French, Spanish, German, Italian, Chinese, Korean, & Portuguese2,000 data points per parameter, per user ID, up to 10 user ID’s + Default Manual, timed selectable every 3 to 86400 sec. (24 hours)YesYes, user selectable, visual & audible, parameter based9 V DC adapter, center positive, 1.3 A (100 / 240 VAC, SMPS)

Specifications and Ordering Information

Description Catalog No.XL600 Deluxe Kit 13-636-XL600DXL600 Kit 13-636-XL600XL600 Meter Only 13-636-XL600AFisher Scientific accumet Benchtop Stirring Probe 13-620-BSP

Fisher Scientific accumet XL600 pH/mV/Temp/ISE/DO/Conductivity Meter

XL600 Deluxe Kit: Includes meter, self-stirring BOD probe (13-620-SSP), TRIS compatible accuTupH pH electrode (13-620-183A), ATC probe (13-620-19), Conductivity/Temp probe (13-620-100), electrode arm, RS-232 & USB cables, 100/240 V power supply, and manual.

XL600 Kit: Includes meter, TRIS compatible accuTupH pH electrode (13-620-183A), ATC probe (13-620-19), Conductivity/Temp probe (13-620-100), electrode arm, RS-232 & USB cables, 100/240 V power supply, and manual.

XL600 Meter Only: Includes meter, electrode arm, RS-232 & USB cables,100/240 V power supply, and manual.

9

Full-function pH and mV capabilities. Extended pH range, with resolution adjustable to 0.001 and calibration from 5 preset buffer groups, custom buffers, and up to six points for exceptional ±0.002 accuracy.

Ion-selective electrode measurement is easy, with the ion name displayed right on the measurement screen so you’ll never have the wrong ISE curve. Automatically run direct or addition/subtraction methods. On-screen prompts allow easy entry of volumes and concentrations,

quickly providing sample concentration without tedious paper calculations.

Measure conductivity, salinity, or resistivity from 0 to 500 mS. Selectable temperature coefficients, cell constants, and display units ensure accurate readings throughout a broad range of samples.

Multi-Channel Operation Simplifies Your Lab Work


XL500 Meter Only: Includes meter, electrode arm, RS-232 & USB cables, 100/240 V power supply, and manual.

Description Catalog No.XL500 Kit 13-636-XL500XL500 Meter Only 13-636-XL500AFisher Scientific accumet Benchtop Stirring Probe 13-620-BSP

» Up to three channels measured and displayed simultaneously









Fisher Scientific accumetXL500 pH/mV/Temp/ISE/Conductivity Meter

pH Mode RangeResolutionAccuracyAuto Buffer Recognition

-2.000 to 20.0000.1 / 0.01 / 0.001±0.1 / 0.01 / 0.002 ±1 LSD5 preset buffer groups + custom

mV Mode Range ResolutionAccuracy

±2000 mV / Rel mV 0.1±0.2

Temperature Mode RangeResolutionAccuracy

-5.0 to 105.0 ºC0.1 ºC (0.1 ºF) ±0.2 ºC (±0.3 ºF)

Ion Mode RangeResolutionAccuracy

1 x 10-6 to 9.99 x 1010

0.1 / 0.01 / 0.001±0.5 % full scale (monovalent ion) 1 % full scale (divalent ion)

Conductivity Mode Range ResolutionAccuracy

0 to 500.0 mS 0.01 / 0.1 μS ; 0.001 / 0.01 / 0.1 mS±1 % full scale

TDS Mode Range

0.050 ppm to 500 ppt (@ TDS factor 1.00)

Salinity Mode Range

0 to 80.0 ppt

Resistivity Mode Range

2.000 Ω to 20.0 MΩ

Output RJ45, RS232, USB-A, mini-B USB, stirrer port (2)

Language Selection English, French, Spanish, German, Italian, Chinese, Korean, & Portuguese

High / Low Alarms Yes, user selectable, visual & audible, parameter based


Kit includes 13-620-100 cell. For other conductivity cells, see page 34.

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No Need To Swap Probes – Measure And Display Two Channels Simultaneously

Fisher Scientific accumet XL200 pH/mV/Temp/Conductivity Meter

The XL200 combines two instruments in one; a pH/mV/Temperature meter and Conductivity/TDS/Resistivity/Salinity meter. Display one parameter for better focus and live graphing, or choose dual display with a touch of the screen.

Use one or two optional 13-620-BSP stirring probes for best results. Use optional 13-637-671 to add a second electrode arm and measure on both sides of the XL200.

The XL200 is compatible with a variety of Fisher Scientific accumet conductivity cells to match your requirements. Selectable cell constants let you use K = 1 cells for general purpose, 0.1 cells for high purity water, or 10 cells for brines or other concentrated solutions.

» Measure pH/Temp and Conductivity/Temp simultaneously











Description Catalog No.XL200 Kit 13-636-XL200 XL200 Meter Only 13-636-XL200AFisher Scientific accumet Benchtop Stirring Probe 13-620-BSP




±2000 mV / Rel mV 0.1±0.2


-5.0 to 105.0 ºC0.1 ºC (0.1 ºF) ±0.2 ºC (±0.3 ºF)

Conductivity Mode Range ResolutionAccuracy

0 to 500.0 mS 0.01 / 0.1 μS ; 0.001 / 0.01 / 0.1 mS±1 % full scale

TDS Mode Range

0.050 ppm to 500 ppt (@ TDS factor 1.00)

Salinity Mode Range

0 to 80.0 ppt

Resistivity Mode Range

2.000 Ω to 20.0 MΩ






11

Multiple BNC Ports Allow Flexibility

Fisher Scientific accumet

XL250 pH/mV/Temp/ISE Meter

Ion-selective electrode measurement has never been this easy. And with dual-channel capability, there is no need to recalibrate every time you switch from pH to ISE measurement. The XL250 displays the ion name right on the measurement screen so you’ll never have the wrong ISE curve.

Addition/subtraction methods are almost foolproof. The XL250 prompts you through the method steps, allowing easy entry of volumes and concentrations, providing you with the sample concentration without tedious paper calculations.

Fluoride Kit: Includes meter, 13-620-629 fluoride electrode, TRIS compatible accuTupH pH electrode (13-620-183A), ATC probe (13-620-19), electrode arm, RS-232 & USB cables, 110/220 V power supply, and manual.

Ammonia Kit: Includes meter, 13-620-509 ammonia electrode, TRIS compatible accuTupH pH electrode (13-620-183A), ATC probe (13-620-19), electrode arm, RS-232 & USB cables, 110/220 V power supply, and manual.

Meter Kit: Includes meter, TRIS compatible accuTupH pH electrode (13-620-183A), ATC probe (13-620-19), electrode arm, RS-232 & USB cables, 110/220 V power supply, and manual.

Meter Only: Includes meter, electrode arm, RS-232 & USB cables, 100/240 V power supply, and manual.

Description Catalog No.XL250 Fluoride Kit 13-636-XL250FXL250 Ammonia Kit 13-636-XL250NXL250 Kit 13-636-XL250XL250 Meter Only 13-636-XL250A

» Dual-BNC channels; use them for pH or mV or ion selective measurement – you decide

» Accepts any pH, ORP, or ion selective electrode with BNC connector

» View independent electrode slope in each channel and each range at a glance







Ion Selective Electrodes (ISE)Description Catalog No.Fluoride 13-620-629Ammonia 13-620-509Nitrate 13-620-534Chloride 13-620-627Sodium 13-620-503A




±2000 mV / Rel mV 0.1±0.2


-5.0 to 105.0 ºC0.1 ºC (0.1 ºF) ±0.2 ºC (±0.3 ºF)

Ion Mode RangeResolutionAccuracy

1 x 10-6 to 9.99 x 1010

0.1 / 0.01 / 0.001±0.5 % full scale (monovalent ion) 1 % full scale (divalent ion)






12

XL150 Kit: Includes meter, TRIS compatible accuTupH pH electrode (13-620-183A), ATC probe (13-620-19), electrode arm, RS-232 & USB cables, 110/220 V power supply, and manual.


Description Catalog No.XL150 Kit 13-636-XL150XL150 Meter Only 13-636-XL150AFisher Scientific accumet Benchtop Stirring Probe 13-620-BSP

Measure pH and mV with all the power of the top-of-the-line XL600. The XL150 offers simplified, single-channel operation but doesn’t skimp on performance or features. Offers the same extended pH range (-2 to 20), with resolution

adjustable to 0.001 and calibration at up to six points for exceptional accuracy (±0.002).

Extensive GLP capabilities with customizable printer or computer output and 2000-reading

Simple Yet Powerful, Large Full-Color Touch Screen For Easy Operation

» Calibrate with custom pH buffer values that you choose or automatically from one of six preset buffer groups including a new pure water buffer group

» New high-resolution color display provides crystal clear data from wide viewing angles and at a distance


» New bidirectional communication for LIMS connectivity and 3rd party software

» USB host connectivity for peripherals such as keyboard, mouse, or other USB device


» Optional calibration reminder & high/low alarm

» Create up to 10 password protected ID’s; each includes memory to store 2000 data points. Base ID’s on individual users, applications, or projects to keep data separate, and retain unique calibration and instrument settings

» 3-year instrument warranty; register at fishersci.com/accumet

Fisher Scientific accumet XL150 pH/mV/Temp Meter

pH ModeRangeResolutionAccuracyAuto Buffer Recognition

-2.000 to 20.0000.1 / 0.01 / 0.001±0.1 / 0.01 / 0.002 ±1 LSDUSA: 2.00, 4.01, 7.00, 10.01, 12.00 NIST: 1.68, 4.01, 6.86, 9.18, 12.46DIN 19267: 1.09, 3.06, 4.65, 6.79, 9.23, 12.75FSCI: 1.00, 3.00, 6.00, 8.00, 10.00, 13.00Pure Water: 4.10, 6.97, 9.15CUSTOM: 2-5 points; any values ≥1.0 pH units apart


±2000 mV / Rel mV 0.1±0.2


-5.0 to 105.0 ºC0.1 ºC (0.1 ºF) ±0.2 ºC (±0.3 ºF)






datalog capability. Print setup allows you to print exactly what you want, exactly when you want to.

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Versatile BNC Connection For pH, Redox/ORP, Or Ion Selective Measurements

Fisher Scientific accumetAB250 pH/mV/ISE/Temp Meter

Affordable Ion measurements have never been easier with the AB250. Connect a pH electrode for use as a pH meter or connect any Ion Selective Electrode when ion measurement is desired.

View detailed calibration data with touch of a button. Collapse the display to show the main reading with temperature, or expand to display additional details.

AB250 Kit: Includes meter, TRIS compatible pH/ATC electrode (13-620-631), electrode arm, RS-232 & USB cables, 100/240 V power supply, and manual.

AB250 Meter Only: Includes meter, electrode arm, RS-232 & USB cables, 100/240 V power supply, and manual.

Description Catalog No.AB250 Kit 13-636-AB250AB250 Meter Only 13-636-AB250A

pH Mode RangeResolutionAccuracy Buffer Sets Slope Display Temp Compensation

-2.000 to 20.000 pH0.1 / 0.01 / 0.001 pH±0.002 pH + 1 LSD USA: 2.000, 4.010, 6.997, 10.013, 12.000NIST: 1.678, 4.010, 6.865, 9.184, 12.460DIN: 1.090, 3.060, 4.650, 6.790, 9.230, 12.750FSCI: 1.000, 3.000, 6.000, 8.000, 10.000, 13.000CUSTOM: Any 2-5 values, ≥1.0 pH unit apartYes, up to 5 different slopes with offset Automatic or manual (0 to 100 ºC / 32 to 212 ºF)

mV Mode RangeResolutionAccuracy Offset Adjustment

±2000.0 mV / Rel. mV0.1 mV±0.2 mV or ±0.05 % whichever is greater Up to ±150 mV

Ion Mode RangeResolution UnitsAccuracy Cal Points

0.001 to 19999 (±2000 mV)0.001 / 0.01 / 0.1 / 1 (automatic)ppm, mg/L, molar0.5 % full scale (monovalent ion)1 % full scale (divalent ion)2 to 6 points from one of following groups; 0.001, 0.01, 0.1, 1, 10, 1000.01, 0.1, 1, 10, 100, 10000.02, 0.2, 2, 20, 200, 20000.1, 1, 10, 100, 1000, 100000.05, 0.5, 5, 50, 500, 5000

Temperature Mode ResolutionAccuracy Calibration

0.1 ºC / 0.1 ºF±0.3 ºC / ±0.5 ºFOffset in 0.1 º increments; offset range: ±5 ºC / 9 ºF

Output RS-232 (phono plug), mini-B USB, stirrer


Memory 500 data sets, viewableDatalogging Manual, timed (selectable every 3 to 3600 seconds)

Printer or CSV formatCal Due Alarm Yes, user selectable from 8 hrs, 16 hrs, & 1-31 days


Specifications and Ordering Information» NEW model for pH/mV/Ion Selective measurements

» Date and Time to meet GLP

» Password protection

» Calibration reminder & high/low alarm

» Toggle views with a touch of a button

» Graphic LCD with adjustable backlight

» Calibrate with custom pH buffer values or preset buffer groups

» 500 point memory – log manually or at intervals

» Easily view calibration data

» Upgradable software

» Selectable 0.1 / 0.01 / 0.001 pH resolution

Ion Selective Electrodes (ISE)Description Catalog No.Fluoride 13-620-629Ammonia 13-620-509Nitrate 13-620-534Chloride 13-620-627Sodium 13-620-503A


14

AB150 BioBasic Kit: Includes meter, TRIS compatible accuTupH pH electrode (13-620-183A), ATC probe (13-620-19), electrode arm, 110/220 V power supply, and manual.

AB150 Kit: Includes meter, TRIS compatible pH/ATC electrode (13-620-631), electrode arm, RS-232 & USB cables, 100/240 V power supply, and manual.


Description Catalog No.AB150 BioBasic Kit 13-636-AB150BAB150 Kit 13-636-AB150AB150 Meter Only 13-636-AB150A

For laboratories that need a basic, accurate, easy-to-use pH/mV meter with exceptionally high accuracy and resolution, the AB150 meter is the perfect choice.

» Easy-to-understand prompts

» New graphic display with adjustable backlight

» Calibrate with custom pH buffer values

» Date and Time to meet GLP





» 0.001 pH resolution and ±0.002 pH accuracy!

Intuitive, Simple Operation And High Accuracy In A Compact, Affordable Meter

Replacement Parts And Accessories For AB Series Benchtop Meters

Description Catalog No.Fisher Scientific accumet™ Benchtop Stirring Probe 13-620-BSPpH Electrode, Double Junction, Glass Body, Refillable 13-620-183ApH/ATC Electrode, Double Junction, Plastic Body, Refillable 13-620-631Temperature Probe, Stainless Steel 13-620-19Compact Printer, 100-240 V. Includes 1 Roll of Paper 13-637-690Replacement Power Supply, 100/240 V 13-636-104

Fisher Scientific accumet AB150 pH/mV/Temp Meter



mV Mode RangeResolutionAccuracy Offset Adjustment

±2000.0 mV / Rel. mV0.1 mV±0.2 mV or ±0.05 % whichever is greater Up to ±150 mV



Output RS-232 (phono plug), mini-B USB, stirrer


Memory 500 data sets, viewableDatalogging Manual, timed (selectable every 3 to 3600 seconds)

Printer or CSV formatCal Due Alarm Yes, user selectable from 8 hrs, 16 hrs, & 1-31 days



Easy operation, accuracy, and affordability set the Fisher Scientific accumet AB150 meter apart from the competition.

Kits include electrodes suitable for use with samples that contain Tris buffer, heavy metals, or sulfides.

15

An Accurate, Affordable, Multi-Parameter Instrument

The AB200 is a multi-parameter instrument capable of measuring pH, temperature, conductivity, total dissolved solids, resistiv ity, and salinity. Temperature is measured in two channels; a high accuracy thermistor built-in to

the conductivity probe, or separately along with the pH reading.

A generous graphic backlit display makes the AB200 meter easy to read, while plain language

» New model measures pH & Conductivity/TDS/Resistivity/Salinity

» Choose to display one parameter or pH and another parameter together

» Graphic LCD with adjustable backlight

» Date and time to meet GLP





Fisher Scientific accumetAB200 pH/Conductivity/Temp Meter

AB200 Meter Kit: Includes meter, TRIS compatible pH/ATC electrode (13-620-631), Conductivity/Temp probe (13-620-100), electrode arm, RS-232 & USB cables, 100/240 V power supply, and manual.


Description Catalog No.AB200 Kit 13-636-AB200AB200 Meter Only 13-636-AB200AFisher Scientific accumet™ Benchtop Stirring Probe 13-620-BSP



mV Mode Range ResolutionAccuracy Offset Adjustment

±2000.0 mV / Rel. mV 0.1 mV±0.2 mV or ±0.05 % whichever is greater Up to ±150 mV



Conductivity Mode RangeResolution Accuracy Coefficient (Per ºC) Normalization

0.00 µS to 500.0 mS 0.01 / 0.1 µS ; 0.001 / 0.01 / 0.1 mS ±1 % full scale Linear & pure ; adjustable 0.000 to 10.000 % 15.0 to 30.0 ºC

TDS Mode RangeResolution Accuracy TDS Factor

0.00 ppm to 500 ppt (@ TDS factor 1.00)0.01 / 0.1 ppm ; 0.001 / 0.01 / 0.1 ppt ±1 % full scale 0.400 to 1.000

Salinity Mode RangeResolution Accuracy

0 to 80.0 ppt0.01 / 0.1 ppm ; 0.001 / 0.01 / 0.1 ppt ±1 % full scale

Resistivity Mode RangeResolution Accuracy

2.000 Ω to 20.0 MΩ0.01 / 0.1 Ω ; 0.001 / 0.1 kΩ ; 0.01 MΩ±1 % full scale

Output RS-232 (phono plug), mini-B USB, stirrerLanguage Selection English, Deutsch, 中文, Français, Italiano, & EspañolMemory 500 data sets, viewableDatalogging Manual, timed (selectable every 3 to 3600 seconds)

Printer or CSV formatCal Due Alarm Yes, user selectable from 8 hrs, 16 hrs, & 1-31 daysHigh / Low Alarms Yes, user selectable, visual & audible




prompts and error messages guide the user through measurements and calibrations. Change the display view with a press of a button.

16

Description Catalog No.Fisher Scientific accumet Benchtop Stirring Probe 13-620-BSPReplacement Paddle with Stirring Rod 13-620-RPElectrode Holding Arm and Bracket for AB & XL Series Benchtop Meters 13-637-671

Simple “Plug and Stir” Technology Available With New AB & XL Series

Fisher Scientific accumet Benchtop Stirring Probe

Speed 1 Speed 2 Speed 3 Speed 4 Speed 5

» Provides mixing without magnetic stir bars or stir plates required!

» Saves valuable bench space

» Quiet operation

» Adjustable speed control

» No additional power required

» Multi-parameter XL benchtop models can accept up to two probes for simultaneous stirring

» Compatible with the following models: - XL150, XL200, XL250, XL500, XL600 - AB150, AB250, AB200

Slim design allows effortless mixing.

AB200 Meter Kit: Includes meter, TRIS compatible pH/ATC electrode (13-620-631), Conductivity/Temp probe (13-620-100), electrode arm, RS-232 & USB cables, 100/240 V power supply, and manual.


Description Catalog No.AB200 Kit 13-636-AB200AB200 Meter Only 13-636-AB200AFisher Scientific accumet™ Benchtop Stirring Probe 13-620-BSP



mV Mode Range ResolutionAccuracy Offset Adjustment

±2000.0 mV / Rel. mV 0.1 mV±0.2 mV or ±0.05 % whichever is greater Up to ±150 mV



Conductivity Mode RangeResolution Accuracy Coefficient (Per ºC) Normalization

0.00 µS to 500.0 mS 0.01 / 0.1 µS ; 0.001 / 0.01 / 0.1 mS ±1 % full scale Linear & pure ; adjustable 0.000 to 10.000 % 15.0 to 30.0 ºC

TDS Mode RangeResolution Accuracy TDS Factor

0.00 ppm to 500 ppt (@ TDS factor 1.00)0.01 / 0.1 ppm ; 0.001 / 0.01 / 0.1 ppt ±1 % full scale 0.400 to 1.000

Salinity Mode RangeResolution Accuracy

0 to 80.0 ppt0.01 / 0.1 ppm ; 0.001 / 0.01 / 0.1 ppt ±1 % full scale

Resistivity Mode RangeResolution Accuracy

2.000 Ω to 20.0 MΩ0.01 / 0.1 Ω ; 0.001 / 0.1 kΩ ; 0.01 MΩ±1 % full scale

Output RS-232 (phono plug), mini-B USB, stirrerLanguage Selection English, Deutsch, 中文, Français, Italiano, & EspañolMemory 500 data sets, viewableDatalogging Manual, timed (selectable every 3 to 3600 seconds)

Printer or CSV formatCal Due Alarm Yes, user selectable from 8 hrs, 16 hrs, & 1-31 daysHigh / Low Alarms Yes, user selectable, visual & audible

Ordering Information

17

Go Portable! Indoor or outdoor these new Fisher Scientific accumet meters are versatile and rugged enough for the most demanding applications. Soft touch keys with comfort grip make one-handed operation a breeze.

Meters are small enough for a shirt pocket, yet smart enough for any laboratory. The AP100 kits include an unbreakable pH/temperature electrode that is refillable for a fast response and the longest life.

Fisher Scientific accumet AP110, AP115 And AP125 MetersAccurate Measurements Anytime, Anywhere

» Large LCD with backlighting and plain-language text – easy to view and use

» Rugged waterproof IP67 housing

» 0.001 pH resolution and date/time to meet GLP (AP115, AP125)

» 200 data point internal memory

» 3-year meter warranty 1-year electrode warranty

Meter Only: Includes meter, 9 V battery, and manual.

Meter Kit: Includes meter, pH/ATC electrode (13-620-AP50A), refill solution, hard carrying case, sample bottles, pH calibration packets, 9 V battery, and manual.

Description Catalog No.AP125 Meter Kit 13-636-AP125 AP125 Meter Only 13-636-AP125A AP115 Meter Kit 13-636-AP115AP115 Meter Only 13-636-AP115AAP110 Meter Kit 13-636-AP110AP110 Meter Only 13-636-AP110A

Replacement Parts And Accessories For AP100 Series Portable Meters

Description Catalog No.pH/ATC Electrode, Single-Junction, Epoxy Body, Refillable 13-620-AP50ApH/ATC Electrode, Double-Junction, Epoxy Body, Refillable 13-620-AP61pH/ATC Electrode, Double-Junction, Epoxy Body, Gel Filled 13-620-AP52Optional 110/220 V Power Supply 13-636-100Temperature Probe, Stainless Steel 13-620-AP53

pH Mode Range

AP110 AP115, AP125

ResolutionAP110 AP115, AP125

AccuracyAP110 AP115, AP125

Calibration

-2.00 to 20.00-2.00 to 20.000

0.1 / 0.010.1 / 0.01 / 0.001

±0.01±0.002Up to 5 or 6 points from 3 sets: (USA: 2.00, 4.00, 7.00, 10.00 12.00; NIST: 1.68, 4.01, 6.86, 9.18, 12.45;EURO: 1.00, 3.00, 6.00, 8.00, 10.00, 13.00)

Ion Concentration Mode (AP125 Only)RangeResolutionAccuracyCalibration PointsAvailable Calibration Values

0.001 to 99,9991, 2, or 3 significant digits0.5 % FS (monovalent); 1 % FS (trivalent)From 2 to 5 points0.1, 0.5, 1, 2, 5, 10, 50, 100, 500, 1000

mV, Relative mV ModeRangeResolutionAccuracy Calibration Points

±20000.1 / 1±0.2 / 21 (Rel mV)

Temperature ModeRangeResolutionAccuracyCalibration PointsAvailable Calibration Values

-5 to 100 ºC0.1 ºC±0.31 (ATC) & 1 (MTC)1 point ±5 adjustment (ATC),-5 to 100 default adjustment (MTC)

Date/Time & GLP(AP115 & AP125 Only)

Yes


The AP125 accepts any ion selective electrode (ISE) with a BNC connection for direct ion concentration measurement from 0.001 to 99,999 ppm.

18

•Excellent±0.01pHaccuracy

•Advancedsetupmodeallowsfor meter customization

•AcceptsstandardpHorORPelectrodeswith a BNC connector

The AP71 and AP72 meters feature advanced pH meter functions in a waterproof, dustproof

housing that floats. These meters read pH, mV or relative mV, and temperature in ºC. The AP72 meter also reads temperature in ºF. Both meters have excellent ±0.01 pH accuracy.

The ergonomic design of the AP71 and AP72 meter fits comfortably in your hand. Use the detachable electrode bracket to position the electrode for one-handed operation. Advanced setup mode lets

you customize meter parameters and check electrode slope and offset to ensure electrode accuracy.

The AP71 and AP72 pH meters are ideal for basic pH and mV readings in both harsh environmental conditions and general laboratory applications.

Durable And Reliable Portable Meters

Fisher Scientific accumet AP71 And AP72 Meters

» Measures pH, mV, and relative mV to 0.01 pH and 0.1 mV

» Dual display shows pH or mV, and temperature

» Push-button pH calibration with auto-buffer recognition

» Manual or automatic temperature compensation

» Store and recall 16 readings with corresponding temperature

AP72 Meter Also Features:» Real-time clock stamps stored

data and calibration data with date and time

» Expanded memory stores up to 50 readings

» Selectable pH buffer sets: Standard US, NIST, and DIN buffers

» Selectable automatic endpoint freezes reading when stable

» ºC/ºF selectable

Meter Only: Includes meter, AAA batteries, and manual.

Meter Kit: Includes meter, pH/ATC electrode (13-620-AP55), refill solution, hard carrying case, 60 ml sample bottles of storage solution, rinse water, pH 4 and pH 7 buffers, AAA batteries, and manual.

Description Catalog No.AP72 Meter Kit 13-636-AP72 AP72 Meter Only 13-636-AP72AAP71 Meter Kit 13-636-AP71AP71 Meter Only 13-636-AP71A

Replacement Parts And Accessories For AP 71 And AP 72 Series Portable Meters

Description Catalog No.Temperature Probe For AP 71 And AP 72, 316 Stainless Steel, 3-Ft Cable 13-620-20

Memory AP71 AP72

Stores 16 data setsStores 50 data sets

pH Mode RangeResolutionRelative AccuracyAutomatic Buffer RecognitionCalibration Points

AP71 AP72

-2.00 to 16.000.01±0.01Yes

5 (1.68, 4.01, 7.01, 10.01, 12.45)6 (US: 1.68, 4, 7, 10, 12.45; NIST: 1.68, 4.01, 6.86, 9.18, 12.45; or DIN: 1.09, 2.06, 4.65, 6.79, 9.23, 12.75)

mV ModeRangeResolutionAccuracy

±2000.00.1 / 1±0.2 / ±2

Temperature ModeRange

AP71 AP72

ResolutionAccuracy

0.0 to 100.0 ºC0.0 to 100.0 ºC, 32.0 to 212.0 ºF0.1 ºC / 0.1 ºF±0.5 ºC / ±0.5 ºF

Inputs BNC, ATC


See pages 24 for a list of other pH electrodes.

See page 36 for calibration solutions.

19

Memory (AP75 Only) Stores 50 data setsConductivity ModeCell Constants

AP75AP85

RangeConductivityTDS

AccuracyCalibration Points

0.1, 1.0, 10 1.0

0.00 to 199.9 mS/cm0.00 to 200 ppt±1 % full scaleUp to 5 points

Temperature ModeRangeResolutionAccuracy

0.0 to 100.0 °C, 32.0 to 212.0 °F 0.1 °C / 0.1 °F±0.5 °C / ±0.9 °F±0.2 °C (±0.3 °F)

pH Mode (AP85 Only)RangeResolutionRelative AccuracyCalibration Points

-2.00 to 16.000.01±0.015 (1.68, 4.01, 7.00, 10.00, 12.45)


AP85 Meter: Includes meter, pH/ATC electrode (13-620-AP55), conductivity/ TDS/temp probe (13-620-AP54), AAA batteries, and manual.

AP85 Meter Kit: Includes meter, pH/ATC electrode (13-620-AP55), conductivity/TDS/temp probe (13-620-AP54), hard carrying case, pH buffer solutions, conductivity calibration solutions, AAA batteries, and manual.

AP75 Meter: Includes meter, conductivity/TDS/temp probe (13-620-AP54), batteries, and instruction manual.

AP75 Meter Kit: Includes meter, conductivity/TDS/temp probe (13-620-AP54), hard carrying case, conductivity calibration solutions, sample bottle, batteries, instruction manual, and hard plastic carrying case.

Description Catalog No.AP85 Meter Only 13-636-AP85AAP85 Meter Kit 13-636-AP85AP75 Meter Only 13-636-AP75AAP75 Meter Kit 13-636-AP75

Replacement Parts And Accessories For AP85 And AP75 Meters

Description Catalog No.Replacement Conductivity/TDS/Temperature Probe 13-620-AP54Replacement pH/ATC Electrode, 3-Ft Cable Electrode 13-620-AP55

The AP75 and AP85 meters measure both conductivity and TDS plus temperature with a housing that’s perfect for rough conditions. These waterproof, dustproof meters float, and are very easy to clean.

Advanced setup mode lets you customize meter parameters. Auto-ranging for conductivity and TDS measurements offers fast response over the entire range. Adjust temperature coefficient from 0 to 10 % per °C or °F for accurate compensation in almost any solution.

The AP75 meter offers a real-time clock, expanded memory function, and selectable cell constant. The AP85 meter measures pH, conductivity and TDS plus temperature. AP85 also features five-point pH calibration with ATC and auto-buffer recognition.

Rugged Waterproof Portable Meters


» Completely waterproof and dustproof

» °C/°F selectable

» ±1 full-scale accuracy for conductivity and TDS measurements

» Switch from conductivity and TDS with the press of a button

» Dual display shows conductivity or TDS plus temperature

» Auto-ranging for conductivity across five ranges

» Five point conductivity and TDS calibration

AP75 Meter Also Features:» Real-time clock stamps

stored data and calibration data with date and time

» Memory function stores and recalls up to 50 readings

AP85 Meter Also Features:» pH measurement with

five-point pH calibration and auto-buffer recognition

AP85

AP85 meter kit

20

Memory (AP75 Only) Stores 50 data setsConductivity ModeCell Constants

AP75AP85

RangeConductivityTDS


0.1, 1.0, 10 1.0

0.00 to 199.9 mS/cm0.00 to 200 ppt±1 % full scaleUp to 5 points


0.0 to 100.0 °C, 32.0 to 212.0 °F 0.1 °C / 0.1 °F±0.5 °C / ±0.9 °F±0.2 °C (±0.3 °F)


-2.00 to 16.000.01±0.015 (1.68, 4.01, 7.00, 10.00, 12.45)


Description Catalog No.Replacement Conductivity/TDS/Temperature Probe 13-620-AP54Replacement pH/ATC Electrode, 3-Ft Cable Electrode 13-620-AP55

Choose AP84 For pH/DO/Temp Or AP74 For DO/Temp Only


These meters also feature a galvanic probe design. This design allows the user to take dissolved oxygen measurements immediately, without the warm up time of other probe designs! Advanced features include display of probe diagnostics. The waterproof, dustproof housing floats, and is very easy to clean.

The AP84 meter also takes pH readings with ±0.01 pH accuracy.

» Durable Waterproof design with IP67 rating

» No meter warm-up required

» Adjustable backlit display

» Dual display shows mg/L (ppm) or % saturation plus temperature

» °C/°F selectable

» Independent 100 % and zero adjustment calibrations

» Key in salinity and pressure manually; the meter does the rest

» 3-yr warranty

AP84 Meter Also Features:» pH measurement with

auto-buffer recognition

» Meter displays probe diagnostics, view slope, offset, and mV values

Meter: Includes meter, dissolved oxygen/temp probe (15-500-034), electrolyte, (2) membrane cap assemblies (15-500-037), polishing disk, AAA batteries, and manual.

Meter Kit: Includes meter, dissolved oxygen/temp probe (15-500-034), pH electrode (AP84 only) (13-620-AP56), electrolyte, (2) membrane cap assemblies (15-500-037), hard carrying case, polishing disk, AAA batteries, and manual.

Description Catalog No.AP84 Meter Kit 13-636-AP84AP84 Meter 13-636-AP84AAP74 Meter Kit 13-636-AP74AP74 Meter 13-636-AP74A


Description Catalog No.Replacement Dissolved Oxygen/Temperature Probe With 10-Ft Submersible Cable 15-500-034

Electrolyte Solution For Dissolved Oxygen Probes, 500 mL 15-500-036Replacement pH Electrode For AP84, ABS Body, 10-Ft Cable, 25 mm Dia. 13-620-AP56

Memory (AP74 Only) Stores 50 data setsDissolved Oxygen ModeRange

mg/L (ppm)% Saturation

Resolutionmg/L (ppm)% Saturation


0.00 to 20.000.0 to 200.0

0.010.1±1.5 % full-scale2 point (0 %, 100 %), 1 point (mg/L)


0.0 to 50.0 ºC (32.0 to 122.0 ºF)0.1 ºC (0.1 ºF)±0.3 ºC (±0.5 ºF)


-2.00 to 16.000.01±0.01Up to 5 (1.68, 4.01, 7.00, 10.00, 12.45)


AP74 Meter Also Features:» Real-time clock stamps stored data and

calibration data with date and time

» Memory function stores and recalls up to 50 readings

AP84

AP74

AP84 meter kit

The AP74 and AP84 meters read dissolved oxygen in mg/L, ppm, or % saturation. They use barometric pressure and salinity offset to ensure high accuracy with independent 100 %, zero and offset adjustment capabilities. The adjustable backlit display is ideal for taking readings in low light. Probe includes 10-ft standard cable length.

21

pH Electrodes For Virtually Any Sample Type

Fisher Scientific accumet Electrodes

When selecting a pH system, choose your meter based on what features you need, i.e. resolution, output, memory, etc. Choose the corresponding pH electrode for your meter based primarily on your sample type and conditions, i.e. wastewater with sulfides, room temperature, student use, 5 days/week, etc.

Take a glance in the Fisher Scientific catalog and you will find 100’s of pH electrodes to choose from. While many electrodes might be work adequately for a particular application, not all will perform equally or last as long as others. Usually in situations in which a pH electrode “didn’t last long”, the electrode is not matched well for the application resulting in poor performance, and ultimately failure. Understanding the different electrode options that are available and knowing how to use them to your advantages is a critical step to getting the most out of your pH measurement system.

The following guide is designed to help you understand the ABC’s of electrode selection. If you are still undecided or have questions regarding any product, your Fisher Scientific representative and our electrochemistry experts (888-358-4706 or [email protected]) are there to help guide you!

The ABC’s Of Electrode SelectionCombination Or Half-CellThere are two components within a pH electrode system. A pH indicating (or sensing) electrode develops a potential dependent on the pH, and the reference electrode which provides a constant potential to completes the electrical circuit. Combination electrodes have both the indicating and reference electrodes “combined” into one electrode. Alternatively, separate half-cell electrodes can be used. Since reference electrodes often outlast sensing electrodes, replacing indicating electrodes can mean lower replacement costs than replacing an equivalent combination electrode.

In practical terms, nearly all electrodes used today are combination electrodes. There are many reasons including; many pH meters require an adapter to accept half-cell electrodes, handling multiple electrodes is un-desirable (or impossible with small samples!), half cells don’t have built in ATC and therefore require a third electrode for temperature compensation, the complexity of diagnosing electrode problems and most of all, the reduced cost and performance of today’s combination electrode designs.

Verdict: Use a combination electrode unless the method you must follow calls

for half-cells. You’ll have many more choices available to you. Combination

cells may or may not have a temperature sensor built-in.

Glass Or Plastic BodyIt probably goes without saying, but if an electrode literally breaks into pieces, it is useless and can not be repaired. Combination glass and combination plastic electrodes use an indicating electrode with a glass sensing bulb on the end. This is important for several reasons. First, plastic electrodes are not immune from breakage. Second, if an electrode breaks it will likely be at the tip, not the body itself. A plastic electrode with little to no bulb protection defeats the purpose of a plastic electrode in the first place.

To decide on which to use, let us look at the advantages and disadvantages of each, starting with the glass body electrode. Glass electrodes are easier to clean and maintain since they can tolerate just about any solvent and inorganic material (with the exception of HF!) and can handle higher temperatures quite nicely – typically to 100 °C. The fact that glass electrodes also have a glass sensing bulb is also an advantage. Since the seal that combines the bulb to the body is similar material, it is one less thing that can go wrong during measurement and doesn’t become the source of junction potential as it does in plastic electrodes. This is especially important consideration for applications that have repeated and extreme heating and cooling – the expansion and contraction that occurs is handled much better by glass electrodes. The downside of glass electrodes is fairly easy – they are generally more expensive then plastic, and they have a greater potential for breakage.

Plastic electrodes are less expensive than glass equivalents and can usually take much abuse in the lab and in the field. Most electrodes with built-in temperature compensation elements are plastic due to the complexity in manufacturing them. As a result, they are most popular with field and portable meters, but can also be used in laboratory environments (such as 13-620-631). To protect the glass sensing bulb, many plastic electrodes use an integral housing that limit the bulb exposure, but often can be difficult to clean.

Verdict: Glass electrodes are definitely worth the upgrade if you have

significant temperature fluctuations. If bulb breakage is a concern, consider

Fisher Scientific accumet accuTupH electrodes with thick glass bulbs! If you

want ATC built-in to your electrode, expect to settle for plastic.

Refillable Or Non-Refillable (Gel)All pH electrodes use/leak solution. Refillable electrodes do so more quickly, and can be replenished when they require more filling solution. Gel filled electrodes do so very slowly and when they run out or the gel is no longer flowing, can not be replenished and must be replaced.

Refillable electrodes are generally more expensive than gel-filled equivalent electrodes but respond much faster. They also last longer, because the filling solution can be replaced indefinitely; however the periodic addition of filling solution that is required also happens to be the main disadvantage. Another downside is that when the filling hole is left open for an extended period, dried salt may be left behind which often involves cleaning. The act of refilling and opening and closing the fill hole with Fisher Scientific accumet electrodes is extremely easy due to the patented filling mechanism. It takes just seconds to open the hole and a few seconds more to fill the probe.

Gel-filled electrodes are less expensive, require less maintenance, and are usually plastic. High quality gel formulations have also extended the once limited shelf-life in recent years.

Verdict: Refillable electrodes are usually worth the extra maintenance –

especially if it’s a Fisher Scientific accumet electrode.

Indicating half cell (13-620-187)

Combination electrode (13-620-299)

Reference half cell (13-620-658)

22

Single Or Double-Junction (Tris Compatible)

This decision is extremely important and should not be overlooked. If you will be measuring samples that have sulfides, proteins, heavy metals, TRIS, or anything that might react with silver, or if you will be testing samples that are unknown, use a double-junction electrode. Calomel electrodes would also be suitable but have fallen out of favor due to mercury content and regulations that ban shipments of them in specific states in the US. Single-junction electrodes are less expensive, but offer no other advantages. If you use a single-junction electrode in a solution with TRIS, it’s just a matter of time before it fails.

Verdict: If you will only measure drinking water, you can save money by

using a single-junction pH electrode. If you have TRIS, sulfides, proteins,

heavy metals or are measuring samples that are unknown, look for a

Fisher Scientific accumet electrode with a purple ring – indicating that

is it compatible.

pH, pH/ATC, ORP, and Ion Selective Electrodes

Fisher Scientific accumet Electrodes

Over 30 years of experience in the design, development, and manufacture of electrodes go into each Fisher Scientific accumet electrode.

We offer electrodes that provide fast, accurate measurements in hundreds of different applications – including yours!

A complete line for every application: made with care and precision. All Fisher Scientific accumet electrodes feature continuous electrical shielding and insulation of the internal elements, cable and connectors for extremely stable, reproducible readings with a minimum of electrical noise. Each electrode is individually tested, serialized to meet GLP requirements, and backed by a knowledgeable support staff (888-358-4706 or [email protected]) and 1 year warranty.

Refillable electrodes use our patented twist open and close mechanism.

Color coded electrode bands simplify electrode selection:

SPurple = TRIS CompatibleSBlue = General Purpose

Close

Open

The single-junction electrode on the left has a black, clogged junction and is no longer responsive.

23

Fisher Scientific accumet pH ElectrodesHigh Performance Models For Critical Research

accu•pHast RpH Electrodes

Catalog No. 13-620-195 13-620-196 13-620-197Special accu•pHast R accu•pHast R accuFlow accu•pHast R accuFlowParameter pH pH pHCombination Or Half Cell Combination Combination CombinationATC Connection n/a n/a n/aRefillable Or Gel (Sealed) Refillable Refillable RefillableRefill Solution SP138-500 SP138-500 SP138-500Junction Type Double S Double S Double SGlass Or Plastic Body Glass Plastic GlassMax Temp 100 °C 80 °C 100 °CLength x Diameter (mm) 102 x 12 102 x 12 102 x 12Note: High performance,

ideal for samples temp variationHigh performance, flushable junction for tough samples

High performance, flushable junction for tough samples

State-of-the-art design for fast, accurate measurements despite sample temperature differences – plus extra durability. Feature innovative reference system that controls chemical equilibria, prevents precipitation of solution components at reference element from 0 to 100 °C; plus internal electrolyte with minimal temperature coefficient. Result: highly predictable, super reliable electrodes that respond quickly at any temperature. Cycle between 25 and 80 °C samples, reach reproducible pH in 30 seconds (vs. 1 to 3 minutes

for other electrodes). Drift and accuracy problems are virtually eliminated.

Read sample pH in <20 seconds, correct to ±0.02 pH; pH value stays constant at any temperature. Best of all, these electrodes read pH consistently at elevated temperatures – and without premature loss in performance.

Choice of standard-size glass body, epoxy body with flushable junction, and glass body with flushable junction.

Fast and accurate for samples at widely varying temperatures. Patented design: dual ceramic junctions, sealed reference, and special internal electrolyte to eliminate slow response when measuring samples at different temperatures in quick succession. Accurate to ±0.01 pH at 25 °C and ±0.05 pH from -5 to 100 °C. Response times of 20 seconds or less. Negligible drift.

Isolated reference and outer KCl fill solution prevent clogging from silver-compound precipitates. Unique pH bulb is filled with special crystals to speed thermal equilibrium. Choice of four styles: standard-size glass body, MicroProbe™ extra-long glass body, extra-long epoxy body, and pH/ATC epoxy body.

accu•pHastpH Electrodes

Catalog No. 13-620-296 13-620-297 13-620-298 13-620-113 13-620-114Special accu•pHast accu•pHast

long & narrowaccu•pHast long

accu•pHast accu•pHast

Parameter pH pH pH pH/ATC pH/ATCCombination Or Half Cell Combination Combination Combination Combination CombinationATC Connection n/a n/a n/a 13-620-16 13-620-19Refillable Or Gel (Sealed) Refillable Refillable Refillable Refillable RefillableRefill Solution SP138-500 SP138-500 SP138-500 SP138-500 SP138-500Junction Type accupHast

(Tris compatible) SaccupHast (Tris compatible) S

accupHast (Tris compatible) S



Glass Or Plastic Body Glass Glass Plastic Plastic PlasticMax Temp 100 °C 80 °C 80 °C 80 °C 80 °CLength x Diameter (mm) 102 x 10 165(L) x 75 x 5 140 x 10 143 x 10 143 x 10Note: High performance,

ideal for samples temp variation

High performance High performance See page 34 for list of discontinued meters using 13-620-16 ATC

ATC fits XL, AB, and AR meters

24

Top Selling Rugged Glass And Capillary Junction Electrodes

Fisher Scientific accumet pH Electrodes

Single-pore capillary junction provides a flow channel about 200 times larger than typical reference junctions. Combined with a specially formulated

flowing gel reference electrolyte (13-636-430), provides a fast, virtually clog-free reference. The result is a faster, more stable pH measurement.

accuCap Capillary Junction Electrodes

Catalog No. 13-620-130 13-620-131 13-620-132 13-620-133Special accuCap accuCap accuCap accuCap, spear tipParameter pH pH pH pHCombination Or Half Cell Combination Combination Combination CombinationATC Connection n/a n/a n/a n/aRefillable Or Gel (Sealed) Refillable Gel Gel GelRefill Solution 13-636-430 n/a n/a n/aJunction Type Capillary open pore

(Tris compatible) SCapillary open pore (Tris compatible) S

Capillary open pore (Tris compatible) S

Capillary open pore (Tris compatible) S

Glass Or Plastic Body Glass Glass Plastic GlassMax Temp 80 °C 80 °C 60 °C 50 °CLength x Diameter (mm) 160 x 12 130 x 12 120 x 12 80(L) x 25 x 6Note: Research quality,

included with XL series pH kits

Non-refillable glass electrodes like this are hard to find

General purpose Spear tip and 6 mm diameter useful for semi solids & small samples

Electrolyte & syringe (13-636-430)

accuTupH+ & accuTupH pH Electrodes

Catalog No. 13-620-185 13-620-632 13-620-183A 13-620-182A 13-620-181 13-620-187

Special accuTupH+, accu•pHast

accuTupH accuTupH accuTupH, US Standard Connector

accuTupH accuTupH

Parameter pH pH/ATC pH pH/ATC pH pH indicatingCombination Or Half Cell Combination Combination Combination Combination Combination Half Cell, BNCATC Connection n/a 13-620-19 n/a n/a n/a n/aRefillable Or Gel (Sealed) Refillable Refillable Refillable Refillable Refillable n/aRefill Solution SP138-500 SP138-500 SP138-500 SP138-500 SP135-500 n/aJunction Type accupHast

(Tris compatible) SDouble S Double S Double S Single S n/a

Glass Or Plastic Body Glass Glass Glass Glass Glass GlassMax Temp 100 °C 100 °C 100 °C 100 °C 100 °C 100 °CLength x Diameter (mm) 102 x 10 102 x 12 102 x 12 102 x 10 102 x 10 106 x 12Note: Rugged & fast

temp response, high performance, includes bulb protector

Rugged, Triscompatible,includesbulb protector.ATC for AB, AR, andXL meters.

Rugged, Tris compatible, includes bulb protector. Included with AB150B and XL kits

Rugged, Tris compatible, includes bulb protector. US Std Connector (not BNC)

Rugged, general purpose. includes bulb protector

Rugged, use with reference half cell

Five times thicker than conventional glass pH electrodes. For applications where glass bulbs break frequently and epoxy body electrodes aren’t practical. Up to 40 times tougher than conventional glass pH electrodes, without sacrificing response times.

13-620-185 also utilizes accupHast temp reference for top performance from a rugged glass electrode.

40-mil accuTupH rugged bulb

8-mil standard electrode

25

Fisher Scientific accumet pH ElectrodespH Electrodes To Match Your Application Type

Refillable GlasspH Electrodes

Catalog No. 13-620-285 13-620-223A 13-620-291 13-620-292 13-620-293Special n/a n/a Semi-micro Semi-micro Semi-microParameter pH pH pH pH pHCombination Or Half Cell Combination Combination Combination Combination CombinationATC Type n/a n/a n/a n/a n/aRefillable Or Gel (Sealed) Refillable Refillable Refillable Refillable RefillableRefill Solution SP135-500 SP138-500 SP135-500 SP135-500 SP138-500Junction Type Single S Double S Single S Single S Calomel SGlass Or Plastic Body Glass Glass Glass Glass GlassMax Temp 100 °C 100 °C 100 °C 100 °C 80 °CLength x Diameter (mm) 102 x 12 102 x 12 100 x 6 150 x 6 160(L) x 120 x 6Note: General purpose.

Included with AB15+ and AB15 kits. Includes bulb protector

Tris compatible, includes bulb protector

6 mm diameter for small samples, test tubes

Same as 13-620-291 but longer

Tris compatible

Micro pH And pH/ATC Refillable Electrodes

Catalog No. 13-620-95 13-620-96 13-620-530A 13-620-632 13-620-631Special MicroProbe MicroProbe n/a accuTupH n/aParameter pH pH pH/ATC pH/ATC pH/ATCCombination Or Half Cell Combination Combination Combination Combination CombinationATC Type n/a n/a 13-620-19 13-620-19 13-620-19Refillable Or Gel (Sealed) Refillable Refillable Refillable Refillable RefillableRefill Solution SP138-500 SP138-500 SP135-500 SP138-500 SP138-500Junction Type Calomel

(Tris compatible) SCalomel (Tris compatible) S

Single S

Double S Double S

Glass Or Plastic Body Glass body / Teflon stem Glass body / Teflon stem Plastic Glass PlasticMax Temp 80 °C 80 °C 80 °C 100 °C 80 °CLength x Diameter (mm) 254(L) x 150 x 3 127(L) x 38 x 3 106 x 12 102 x 12 106 x 12Note: Tris compatible,

small samples, long test tubes / NMR

Tris compatible, small samples

ATC for AB, AR, and XL meters

Rugged, Triscompatible, includesbulb protector.ATC for AB, AR, andXL meters.

Tris compatible, ATC forAB, AR, & XL meters. Included with AB150, AB200, & AB250 kits.

26

Refillable PlasticpH Electrodes

Catalog No. 13-620-287A 13-620-221 13-620-300 13-620-288 13-620-289Special n/a n/a n/a n/a Flat surfaceParameter pH pH pH pH pHCombination Or Half Cell Combination Combination Combination Combination CombinationATC Type n/a n/a n/a n/a n/aRefillable Or Gel (Sealed) Refillable Refillable Refillable Refillable RefillableRefill Solution SP135-500 SP138-500 SP138-500 SP138-500 SP135-500Junction Type Single S Double S Calomel S Calomel S Single SGlass Or Plastic Body Plastic Plastic Plastic Plastic PlasticMax Temp 80 °C 80 °C 80 °C 80 °C 80 °CLength x Diameter (mm) 106 x 12 102 x 10 106 x 12 106 x 12 114 x 13Note: Same as 13-620-530A

without ATCTris compatible, includes bulb protector

Tris compatible, with integral bulb guard

Tris compatible Flat surface for agar, cheese, food, and more

Gel-Filled PlasticpH Electrodes

Catalog No. 13-620-108A 13-620-290 13-620-299A 13-620-111 13-620-112Special n/a Long & thin n/a n/a n/aParameter pH pH pH pH/ATC pH/ATCCombination Or Half Cell Combination Combination Combination Combination CombinationATC Type n/a n/a n/a 13-620-19 13-620-16Refillable Or Gel (Sealed) Gel Gel Gel Gel GelRefill Solution n/a n/a n/a n/a n/aJunction Type Single S Single S Double S Double S Double SGlass Or Plastic Body Plastic Plastic Plastic Plastic PlasticMax Temp 80 °C 80 °C 80 °C 80 °C 80 °CLength x Diameter (mm) 106 x 12 178 x 6 106 x 12 106 x 12 106 x 12Note: Ecomomical,

general purposeTall flasks, bottles Ecomomical,

Tris compatibleATC for AB, AR, and XL meters

See page 34 for list of discontinued meters using 13-620-16 ATC

27

Fisher Scientific accumet pH ElectrodesNew pH/ATC Electrodes For Non-accumet Meters

• Combination pH mercury-free electrodes with built-in temperature compensation

• Fast, accurate response from 5 to 80 °C

• Double-junction pH/ATC electrodes compatible with Tris, proteins and sulfides

• Epoxy body is impact resistant and ideal for rough handling

All electrodes have a BNC connector and ATC connector; ATC will differ with meter type. 3-ft cable and electrode storage bottle are included, refillable models also include a 30 mL bottle of filling solution.

Universal pH/ATC Electrodes

Catalog No. 13-620-31C 13-621-701 13-621-702 13-621-703Parameter pH/ATC pH/ATC pH/ATC pH/ATCCombination Or Half Cell Combination Combination Combination CombinationATC Connection RCA (Cinch) plug RCA (Cinch) plug 3.5 audio plug Banana plugRefillable Or Gel (Sealed) Refillable Gel Gel GelRefill Solution SP135-500 n/a n/a n/aJunction Type Single S Double S Double S Double SGlass Or Plastic Body Plastic Plastic Plastic PlasticMax Temp 80 °C 80 °C 80 °C 80 °CLength x Diameter (mm) 106 x 12 106 x 12 106 x 12 106 x 12Note: ATC for Mettler™, Pinnacle™ and

Corning™ metersATC for Mettler™, Pinnacle™ and Corning™ meters

ATC for Beckman™ meters ATC for WTW™ and Pinnacle™ (part numbers ending with “P”)

Catalog No. 13-620-111T 13-620-111 13-620-631Parameter pH/ATC pH/ATC pH/ATCCombination Or Half Cell Combination Combination CombinationATC Connection Mini DIN Mini phone Mini phoneRefillable Or Gel (Sealed) Gel Gel RefillableRefill Solution n/a n/a SP138-500Junction Type Double S Double S Double SGlass Or Plastic Body Plastic Plastic PlasticMax Temp 80 °C 80 °C 80 °CLength x Diameter (mm) 106 x 12 106 x 12 106 x 12Note: ATC for Thermo Scientific Star meters ATC for Denver / Sartorius meters ATC for Denver / Sartorius meters

28

pH/ATC Electrodes For Portable Fisher Scientific accumet Meters

Fisher Scientific accumet pH And Half Cell Electrodes

Half-Cell Electrodes

Catalog No. 13-620-284 13-620-294 13-620-295 13-620-51 13-620-52Special n/a n/a Low na error Ships dry Ships filledParameter pH indicating pH indicating pH indicating Reference ReferenceCombination Or Half Cell Half cell, BNC Half cell, BNC Half cell, BNC Half cell, pin Half cell, pinATC Type n/a n/a n/a n/a n/aRefillable Or Gel (Sealed) n/a n/a n/a Refillable RefillableRefill Solution n/a n/a n/a SP138-500 SP138-500Junction Type n/a n/a n/a Calomel S Calomel SGlass Or Plastic Body Glass Plastic Plastic Glass GlassMax Temp 100 °C 80 °C 80 °C 80 °C 80 °CLength x Diameter (mm) 106 x 12 106 x 12 106 x 12 106 x 12 106 x 12Note: Use with reference

half cellUse with reference half cell

Ideal for samples >pH 11, use with reference half cell

Pin connector, use with indicating half cell


pH/ATC Electrodes For Field Use, accuTupH Half Cell

Catalog No. 13-620-AP52 13-620-AP61 13-620-AP50A 13-620-AP55 13-620-187Special n/a n/a n/a n/a accuTupHParameter pH/ATC pH/ATC pH/ATC pH/ATC pH indicatingCombination Or Half Cell Combination Combination Combination Combination Half cell, BNCATC Type 13-620-16 13-620-AP53 13-620-AP53 13-620-20 n/aRefillable Or Gel (Sealed) Gel Refillable Refillable Refillable n/aRefill Solution n/a SP138-500 SP135-500 SP135-500 n/aJunction Type Double S Double S Single S Single S n/aGlass Or Plastic Body Plastic Plastic Plastic Plastic GlassMax Temp 80 °C 80 °C 80 °C 80 °C 100 °CLength x Diameter (mm) 102 x 12 102 x 12 102 x 12 102 x 12 106 x 12Note: ATC for AP60 & AP100

series metersATC for AP60 & AP100 series meters. Replaces 13-620-AP51

ATC for AP60 & AP100 series meters

ATC for AP70 & AP80 series meters

Rugged, use with reference half cell

29

Fisher Scientific accumet ElectrodesReference Electrodes Use Common Pin Connector Type

Half CellReferenceElectrodes

Catalog No. 13-620-79 13-620-57 13-620-62 13-620-61 13-620-258Special Minature – Sleeve junction Reverse sleeve –Parameter Reference Reference Reference Reference ReferenceCombination Or Half Cell Half cell, pin Half cell, pin Half cell, pin Half cell, pin Half cell, pinRefillable Or Gel (Sealed) Refillable Refillable Refillable Refillable RefillableRefill Solution SP138-500 SP138-500 SP138-500 SP138-500 SP138-500Junction Type Calomel S Calomel S Calomel S Calomel S Calomel SGlass Or Plastic Body Glass Glass Glass Glass PlasticMax Temp 80 °C 80 °C 80 °C 80 °C 80 °CLength x Diameter (mm) 41 x 12 106 x 12 106 x 12, 16 (with sleeve) 106 x 12, 16 (with sleeve) 106 x 12Note: Pin connector, use with

indicating half cellPin connector, non-aqueous samples, use with indicating half cell

Pin connector, for viscous samples, use with indicating half cell

Pin connector, for viscous samples, use with indicating half cell


Half Cell Reference Electrodes

Catalog No. 13-620-259 13-620-53 13-620-216 13-620-273 13-620-46 13-620-658Special – – – – – –Parameter Reference Reference Reference Reference Reference ReferenceCombination Or Half Cell Half cell, pin Half cell, pin Half cell, pin Half cell, pin Half cell, pin Half cell, pinRefillable Or Gel (Sealed) Gel Refillable Refillable Refillable Refillable RefillableRefill Solution n/a SP135-500 1M sodium sulfate SP138-500 SP135-500 Inner 13-620-433

Outer 13-620-434Junction Type Calomel S Single S Single S Double S Single S Double SGlass Or Plastic Body Plastic Glass Glass Glass Plastic PlasticMax Temp 80 °C 100 °C 100 °C 100 °C 100 °C 100 °CLength x Diameter (mm) 106 x 12 106 x 12 106 x 12 106 x 12 108 x 13 108 x 13Note: Pin connector, use

with indicating half cell


Pin connector, use with indicating half cell (13-620-122 rec-ommended) Ag and Cl titrations.



Pin connector, bromide, chloride, copper, iodide, lead, nitrate, silver/sulfide, redox, and pH applications requiring sample-compatible electrolyte, use with indicating half cell

30

Electrodes For Titrations, Redox, And Specialty Applications

Fisher Scientific accumet Half Cell And ORP Electrodes

Reference, Metallic, And ORP Electrodes

Catalog No. 13-620-45 13-620-115 13-620-122 13-620-149 13-620-123 13-620-81Special Side-arm Metallic Metallic Metallic Metallic MetallicParameter Reference Indicating Indicating Indicating Indicating Redox (ORP)Combination Or Half Cell Half cell, pin Half cell, pin Half cell, pin Dual platinum Dual platinum Combination,

BNCRefillable Or Gel (Sealed) Refillable n/a n/a n/a n/a RefillableRefill Solution SP135-500 n/a n/a n/a n/a SP135-500Junction Type Single Redox Redox Redox Redox RedoxGlass Or Plastic Body Glass Glass Glass Plastic Glass GlassMax Temp 100 °C 100 °C 100 °C 80 °C 100 °C 100 °CLength x Diameter (mm) 106 x 12 140 x 12 140 x 12 114 x 13 140 x 13 140 x 12Note: Pin connector,

remote fill with side arm, use with indicating half cell

ORP and titrations Silver and halide titrations

Chlorine titrations with Cl titrimeter. Connect to BNC using 13-620-488 (page 35)

KF, dead-stop titrations, sulfur

BNC, most ORP measurements, includes bulb protector

With coverWith coverTwo pins

connector

Trouble finding an electrode? Try our product selector tool. Go to

fishersci.com/wateranalysis then click products, then electrodes.

Or, scan this:

31

http://www.fishersci.com/ecomm/servlet/cmstatic?storeId=10652&href=Scientific/scientificStandard/Features/Results/Water_Analysis/electrodes.jsp&store=Scientific&segment=scientificStandard&miniSiteNavKey=Electrodes#FisherSci

Fisher Scientific accumet Ion-Selective Electrodes (ISE)Combination And Half Cell ISE’s Have BNC For Universal Meter Use

Solid State ISE

Catalog No. 13-620-627 13-620-519 13-620-547 13-620-629 13-620-523Parameter Chloride Chloride Cupric Fluoride FluorideType ISE - solid-state ISE - solid-state ISE - solid-state ISE - solid-state ISE - solid-stateCombination Or Half Cell Combination Sensing half cell Combination Combination Sensing half cellRefillable Or Gel (Sealed) Refillable Sealed Refillable Refillable SealedRefill Solution 13-620-432 n/a ACCU0834-500 13-620-431 n/a

Ionic Strength Adjuster 13-641-852 13-641-852 13-641-852 TISAB II 13-642-578TISAB III 13-641-874

TISAB II 13-642-578TISAB III 13-641-874

Glass Or Plastic Body Plastic Plastic Glass Plastic PlasticMax Temp 80 °C 80 °C 80 °C 80 °C 80 °CLength x Diameter (mm) 110 x 13 102 x 13 108 x 13 110 x 13 102 x 13Connection BNC BNC BNC BNC BNCInterferences S--, I-, CN-, OH-, Br- Br, I-, CN-, S--, OH- Ag+, Hg++, Cl-, Br-, Fe+, Cd++ OH- OH-

Range (ppm) 1.8 to 35,500 1.8 to 35,500 0.00064 to 6,350 0.02 to saturated 0.02 to saturated

Calibration Solutions 1000 ppm (13-299-87) 1000 ppm (13-299-87) 1000 ppm (23004)

100 ppm (13-641-872)1 ppm w/TISAB II (15-411)2 ppm w/TISAB II (15-412)10 ppm w/TISAB II (13-641-752)

100 ppm (13-641-872)1 ppm w/TISAB II (15-411)2 ppm w/TISAB II (15-412)10 ppm w/TISAB II (13-641-752)

0.1 M NaCl (13-641-876) NaCl (13-641-876) Cu(NO3)2 (13-641-835) NaF (13-641-871) NaF (13-641-871)Typical Applications & Notes:

Water/wastewater, soil, dairy, meats, tomato/vegetable products, Method ASTM/AOAC approved

Water/wastewater, soil, dairy, meats, tomato/vegetable products, Method ASTM/AOAC approved. Requires reference half cell such as 13-620-216.

Plating baths, water Drinking water, stack gases, sea water, minerals, soils, foods, biological fluids, toothpaste, ASTM/EPA Method

Drinking water, air and stack gases, sea water, minerals, soils, foods, biological fluids, toothpaste

Polymer Membrane And Solid State ISE

Catalog No. 13-620-536 13-620-534 13-620-532 13-620-521 13-620-525Parameter Calcium Nitrate Potassium Bromide BromideType ISE -

polymer membraneISE - polymer membrane

ISE - polymer membrane

ISE - solid-state

ISE - solid-state

Combination Or Half Cell Combination Combination Combination Sensing half cell CombinationRefillable Or Gel (Sealed) Refillable Refillable Refillable n/a RefillableRefill Solution 13-642-550 ACCU0807-500 Fill solution (Dilute

ISA from 5M to 0.1M)n/a ACCU0834-500

Ionic Strength Adjuster 13-641-851 13-641-850 13-641-927 ACCU0820-500 13641851Glass Or Plastic Body Plastic Plastic Plastic Plastic GlassMax Temp 40 °C 40 °C 40 °C 80 °C 80 °CLength x Diameter (mm) 102 x 13 102 x 13 102 x 13 102 x 13 108 x 13Connection BNC BNC BNC BNC BNCInterferences Mg++, Zn++, Ba++, K+, Na++,

Ni++, Cu++, Fe++, Sr++, H++, Hg++, PbV

Cl-, NO2-, Br-, CN-,

ClO3-, I-, ClO4

-

Cs+, NH4+, TI+, H+, Ag+,

Tris, Li+, Na+I-, CN-, S-- S--, I-, CN-,

High Cl- levels, NH3

Range (ppm) 0.2 to 40,000 0.5 to 14,000 0.04 to 39,000 0.4 to 79,000 0.4 to 79,000Calibration Solutions 100 ppm

13-641-8621000 ppm = 13-641-910 100 ppm = 13-641-924

1000 ppm = 650016 100 ppm = 649716

1000 ppm ACCU0822-500

1000 ppm ACCU0822-500

0.1 M CaCl2 (13-641-811) NaNO3 (13-641-888) KCl (13-641-917) NaBr (13-641-866) NaBr (13-641-866)Typical Applications & Notes:

Foods, beverages, soil, pharmaceuticals, explosives, fertilizers, plants, EDTA titration endpoint

Pollution testing, foods, pharmaceuticals, fertilizers, plants, meants, pickling baths

Body fluids, soils, sewage, fertilizers, foods, beverages

Biological fluids, soil, plants, foots, effluents, Method ASTM approved. Requires reference half cell

Biological fluids, soil, plants, foots, effluents, Method ASTM approved

32

Gas-Sensing And Glass Membrane ISE

Catalog No. 13-620-509 13-620-511 13-620-503A 13-620-501Parameter Ammonia Carbon Dioxide Sodium Sodium

Type ISE - gas sensing ISE - gas sensing ISE - glass membrane ISE - glass membraneCombination Or Half Cell Combination Combination Combination Sensing half cellRefillable Or Gel (Sealed) Refillable Refillable Refillable RefillableRefill Solution ACCU0800-500 ACCU0806-500 SP138-500 SP138-500Ionic Strength Adjuster 13-641-883 13-641-770 13-641-748 13-641-748Glass Or Plastic Body Plastic Plastic Plastic GlassMax Temp 50 °C 50 °C 60 °C 80 °CLength x Diameter (mm) 108 x 12 108 x 12 106 x 12 108 x 13Connection BNC BNC BNC BNCInterferences Volatile amines, metal cations

that complex ammoniaVolatile organic acids Ag+, Li+, K+, NH4

+ Ag+, Li+, K+, NH4+

Range (ppm) 0.009 to 1,700 0.44 to 1,320 0.023 to 23,000 0.023 to 23,000Calibration Solutions 100 ppm (13-299-98)

1000 ppm (13-641-924C)1000 ppm (13-641-769) 10 ppm (13-641-948)

100 ppm (13-641-909)1000 ppm (13-641-747)1000 ppm w/ISA (13-641-787)

10 ppm (13-641-948)100 ppm (13-641-909)1000 ppm (13-641-747)1000 ppm w/ISA (13-641-787)

0.1 M NH4Cl (13-641-923) NaHCO3 (13-641-768) 10 % NaCl (13-641-876) 10 % NaCl (13-641-876)Typical Applications & Notes:

Sewage effluent, boiler water, fish tanks, stack gases, sea water, biological samples, fertilizers. Uses 13-620-512 replacement membranes

Measures carbon dioxide, carbonate, bicarbonate in soft drinks, wines, ground/sea water, fermentation. Uses 13-620-513 replacement membranes

Steam condensate, meats, fish, dairy, fruit juices, fermentation, ground/sea water, soils, body fluids

Steam condensate, meats, fish, dairy, fruit juices, fermentation, ground/sea water, soils, body fluids. Requires reference half cell

Solid State ISE

Catalog No. 13-620-549 13-620-543 13-620-551 13-620-545 13-620-538Parameter Lead Lead Silver/sulfide Silver/sulfide CyanideType ISE - solid-state ISE - solid-state ISE - solid-state ISE - solid-state ISE - solid-stateCombination Or Half Cell Combination Sensing half cell Combination Sensing half cell CombinationRefillable Or Gel (Sealed) Refillable n/a Refillable n/a RefillableRefill Solution ACCU0834-500 n/a ACCU0834-500 n/a ACCU0808-500Ionic Strength Adjuster – – 13-641-852

SAOB 13-641-882

13-641-852 SAOB 13-641-882

13-641-853

Glass Or Plastic Body Glass Plastic Glass Plastic PlasticMax Temp 80 °C 80 °C 80 °C 80 °C 80 °CLength x Diameter (mm) 108 x 13 102 x 13 108 x 13 108 x 13 102 x 13Connection BNC BNC BNC BNC BNCInterferences Ag+, Hg++, Cu++, CD++, Fe++ Ag+, Hg++, Cu++, CD++, Fe++ Hg++ Hg++ Cl-, Br-, I-, S-- absentRange (ppm) 0.2 to 20,700 0.2 to 20,700 0.01 to 107,900 (Ag+)

0.003 to 32,100 (S--)0.01 to 107,900 (Ag+) 0.003 to 32,100 (S--)

0.1 to 260

Calibration Solutions 100 ppm (13-641-774) – – – –0.1 M Pb(ClO4)2 (13-641-773) Pb(ClO4)2 (13-641-773) – – –Typical Applications & Notes:

Organic compounds, water/wastewater, plating baths

Organic compounds, water/wastewater, plating baths. Requires reference half cell

Sewage effluent, soils, sediments, plating baths, pulping liquors, photographic fixing solution

Sewage effluent, soils, sediments, plating baths, pulping liquors, photographic fixing solution. Requires reference half cell

Silicon petrochemical, plating water, wastes

33

Keep Your Instruments Running Smoothly

Fisher Scientific accumetConductivity, Dissolved Oxygen And Temperature Probes

ATC/Temperature ProbesAll temperature probes are stainless steel and have a 3-ft cable.

Description Catalog No.ATC For XL, AR, And AB Series Benchtop Meters 13-620-19ATC For AP72 And AP71 Portable Meters 13-620-20ATC For AP100 And AP60 Series Portable Meters 13-620-AP53ATC For Discontinued Fisher Scientific accumet Models 10, 15, 20, 25, 30, 50, 150, 750, 800MP Series, And 900 Series 13-620-16

13-620-19

Dissolved Oxygen ProbesDissolved Oxygen Probes And Accessories For Fisher Scientific accumet™ AR60, AR40, AB40, XL40, XL60, And XL600 Benchtop MetersDescription Catalog No.Self-Stirring DO/BOD/Temp Probe 13-620-SSPAdapter To Connect YSI™ Self Stirring DO Probes To AR, AB, XL Series Meters 13-637-DOADPTMembrane Kit For 13-620-SSP. Includes (6) Membrane Caps, Polishing Disk, And Electrolyte Filling Solution 13-637-DOM

Dissolved Oxygen Probes And Accessories For Fisher Scientific accumet™ AP74 And AP84 Portable MetersDescription Catalog No.DO/Temperature Probe With 10-Ft Submersible Cable 15-500-034DO/Temperature Probe With 25-Ft Submersible Cable 15-500-035Electrolyte Solution For Dissolved Oxygen Probes, 500 mL 15-500-036DO Replacement Membrane Assembly, Preassembled Membrane, Membrane Lock, O-ring, Cap 15-500-037

Replacement DO Probe Membranes, Pack Of 25, Requires Membrane Installation Tool 15-500-038

Membrane Installation Tool, Required To Replace Membranes 15-500-039

15-500-034

13-620-SSP

13-637-DOM

13-637-DOADPT

Conductivity CellsConductivity/Temperature Electrodes For Fisher Scientific accumet™ AB200, XL200, XL500, And XL600 Benchtop MetersSensor Type Body Type Nominal Cell Constant Ideal Range Catalog No.2-Cell Epoxy 0.1 0.5 to 2,000 μS 13-620-1012-Cell Epoxy 1 20 μS to 20 mS 13-620-1002-Cell Epoxy 10 1 to 200 mS 13-620-1024-Cell Glass 1 10 μS to 100 mS 13-620-1634-Cell Glass 10 1 to 200 mS 13-620-1644-Cell Epoxy 1 10 μS to 100 mS 13-620-1654-Cell Epoxy 10 1 to 200 mS 13-620-166

Cell For Fisher Scientific accumet™ AP75 And AP85 Portable Meters2-Cell Ultem 1 20 μS to 20 mS 13-620-AP54

13-620-100

13-620-163

13-620-102

13-620-101

13-620-164

13-620-165

13-620-166

13-620-AP54

34

Get The Most Out Of Your System

Accessories/Cables/Printers

BNC Adapter CablesDescription Catalog No.U.S. Standard/Pin To BNC Input Jack 13-620-498Pin Plug To BNC Input Jack. Use With Metallic Electrodes Having Pin Connectors 13-620-490

BNC/Pin Plugs To Single BNC Input Jack 13-620-489

Dual-Pin Plugs To BNC Input Jack 13-620-488

13-6

20-4

98

13-6

20-4

90

13-6

20-4

89

13-6

20-4

88

Other Replacement Parts And AccessoriesDescription Catalog No.Fisher Scientific accumetR Benchtop Stirring Probe 13-620-BSPReplacement Paddle For 13-620-BSP 13-620-RPCompact Thermal Printer For ABxxx And XLxxx Series, 100-240 V.Includes (2) Rolls Paper And 4 Plug Types For Global Use 13-637-690

Replacement 5-Yr Thermal Paper For 13-637-690 (Pack Of 2 Rolls) 13-637-691

Electrode Arm And Bracket For All AB And XL Series Benchtop Meters 13-637-671

Fisher Scientific Optical USB Mouse. Compatible With Any XL Series 13-637-692Replacement Power Supply For AB150, AB200, AB250, XL150, XL200, XL250,XL500, XL600, 100/240 VAC 13-636-104

Replacement RS-232 Output Cable For PC And Printer 13-637-681

13-620-BSP

13-636-104 13-637-690

13-637-69213-637-671

Precision Calibration Resistor KitCheck Meter Compliance To USP Standards. Includes: • Six Precision Resistors (Nominal Values 10 ohm, 100 ohm, 1 kilohm, 10 kilohm,

100 kilohm, And 1 megohm) • Connectors For Fisher Scientific accumet XL, AR, And AB Conductivity Meters • Foam Padded CaseDescription Catalog No.Fisher Scientific accumet Conductivity Calibration Kit 13-637-674

13-637-674

Need this NIST certified? Ask for Innocal 17090-30 certificate on

page 47.

35

Standardized Against NIST Standard Reference Material

Certified Buffer Solutions

• Choose 1 pint (475 mL) plastic bottles or (20) single-use pouchesValue Quantity Catalog No.10 µS 20 pouches 50-632-47923 µS 475 mL 13-300-11484 µS 475 mL 13-300-111447 µS 475 mL 13-300-117447 µS 20 pouches 13-300-1291413 µS 475 mL 13-300-1121413 µS 20 pouches 13-300-1301500 µS 475 mL 13-300-1102070 µS 475 mL 13-300-1152764 µS 475 mL 13-300-1132764 µS 20 pouches 13-300-1318974 µS 475 mL 13-300-11912880 µS 475 mL 13-300-10915000 µS 475 mL 13-300-11815000 µS 20 pouches 13-300-13280000 µS 475 mL 13-300-116

• Tight tolerances: - 0.01 for pH 4.0 and 7.0 - 0.02 for pH 10.0

• Standardized at 25 °C against NIST standard reference material• Label includes temperature correction chartpH Color Coded Size Catalog No.1.68 475 mL 13-643-0024.01 Red 475 mL 13-301-133 5.00 Orange 475 mL 13-640-86.86 475 mL 13-643-0037.00 Yellow 475 mL 13-641-8579.18 475 mL 13-643-00410.01 Blue 475 mL 13-079-31912.46 475 mL 13-643-001

Thermo ScientificTM OrionTM Certified Color-Coded pH Buffers

OaktonTM Conductivity Solutions

For best results, always use fresh buffer solutions. Don’t use expired buffers!

36

Description Catalog No.

Pure Water Low Ionic Strength pH Test Kit – 4 x 475 mL of pH 6.97 Buffer, 2 x 475 mL Of pH 4.10 Buffer, 2 x 60 mL Of pH-ISA Adjuster 13-641-735

Pure Water pH-ISA Low Ionic Strength Adjuster, 5 x 60 mL 13-641-722

Pure Water pH 4.10 Buffer For Low Ionic Strength pH Samples, 4 x 475 mL 13-641-165



13-641-164

13-641-165

13-641-722

Description Catalog No.

Saturated KCl electrode filling solution. Use With Double-Junction And Calomel pH Electrodes (Purple Ring), Or Fluoride (13-620-529), Sodium, And Calcium Combination Ion Selective Electrodes, 500 mL

SP138-500

4 M KCl Saturated with AgCln electrode filling solution. Use with Single-Junction pH Electrodes (Blue Ring), 500 mL

SP135-500

Skylite Electrolyte with Syringe for accuCap 13-620-130 pH Electrode, 60 mL 13-636-430

pH Electrode Storage Solution, 500 mL 13-300-178

Electrode Storage Bottle 13-620-499

Deionized Water Rinse Solution, Box of (20) single-use pouches 13-300-180ORP Standard, +220 mV vs. Ag/AgCl electrode u sing 13-641-686 fill solution, 475 mL 13-641-210

Electrode storage sleeve and base 13-642-145

13-620-49913-641-210

13-636-430

pH Buffers For Low Ionic Strength Samples. Compatible With XL Pure Water Buffer Group

Other Solutions and Accessories

Storage Sleeve

and Base

13-642-145

Contact our team of knowledgeable electrochemistry

experts for recommendations, troubleshooting, and more!

888-358-4706 or [email protected]

37

Next to temperature, pH is quite possibly the most common laboratory measurement today. It crosses over many disciplines from water/wastewater, R&D, environmental, chemical & life sciences, and an endless number of industrial applications.

The pH or power of Hydrogen, is the degree of acidity or alkalinity of a solution based on the hydrogen ion activity, represented by the equation:

pH = -log [H+]

Stated mathematically, pH is the negative logarithmic value of the Hydrogen ion. As it is based on a log scale, each pH unit represents a factor of 10, so a solution with a pH of 5 is 100 times more acidic than pH of 7.

Here are examples of pH in a few common industrial and household products.

Litmus paper can be used for rough pH measurements, but for highest accuracy a potentiometric system using a pH meter and pH electrode is used. The electrode is sensitive to H+ ions, which create a small voltage potential, which is converted to a pH value by the pH meter. Electrode behavior is described by the Nernst equation:

E = Eo + (2.3 RT/nF) log aH+

E is the measured potential from the sensing electrode, Eo is related to the potential of the reference electrode, (2.3 RT/nF) is the Nernst factor and log aH+ is the pH. The Nernst factor, 2.3 RT/nF, includes the Gas Law constant (R), Faraday’s constant (F), the temperature in degrees Kelvin (T) and the charge

Battery acid [0.3]

Vinegar [2.9]

Pickle processing [3.5]

Boric acid [5.0]

Corn [6.2]

Milk [6.7]Fresh water aquarium [7.1]

Household dye [13.6]

[13.1] Bottle washingCopper plating [12.8]

[12.6] Bleach

Ammonia [11.4] [11.3] Brass plating

Milk of magnesia [10.3]

[9.4] Lime-soda softeningBorax [9.3]

[8.4] Baking sodaSaltwater aquarium [8.0] [8.0] Seawater

Blood [7.5] [7.4] Swimming pool water[7.0] Distilled water

[6.3] Brewing process

[5.8] Nickel plating

[4.3] Orange juice

[3.2] Photo engraving

[2.3] Lemon juice

[5.0] Food processing

14

12

11

10

9

8

7

6

5

4

3

2

1

0

13

A Practical Approach To Achieve Best Results

About pH, ORP, And ISE Measurement

of the ion (n). For pH, where n = 1, the Nernst factor is 2.3 RT/F. Since R and F are constants, the factor and therefore electrode behavior is dependent on temperature.

The pH electrode system consists of two half cells: a pH indicating electrode, which develops a potential dependent on the pH of a solution; and a reference electrode, which provides a constant potential and completes the electrical circuit. Using separate pH indicating and reference half cells allows you to select each cell without compromise, tailor the system precisely to the sample’s nature, and achieve good accuracy. It can mean lower replacement costs too, since usually only one of a pair is broken. For ATC, a third electrode is required. Nevertheless, the combination electrode – an indicating half cell and a reference half cell joined co-axially – is by far the most common choice for the convenience and compactness it offers. Some combined electrodes also offer built-in ATC for added convenience.

Temperature CompensationIn a perfect pH electrode – one that measures zero mV at exactly pH 7 – there is no temperature effect on the electrode sensitivity at pH 7 regardless of temperature change. While pH electrodes are not perfect, errors related to temperature are negligible near pH 7, and can be disregarded. As a rule however, the further from pH 7 the solution is and the greater the temperature changes, the greater the expected measurement error due to changes in the electrode’s sensitivity. For most electrodes, the error is approximately 0.003 pH/ºC/pH away from pH 7.

Consider a pH meter that was calibrated at room temperature (25 ºC) and measures a sample at pH 4 at 5 ºC,Temperature difference : 25 ºC - 5 ºC = 20 ºCNumber of pH units away from neutral : 7 pH - 4 pH = 3 pH unitsTotal error : 0.003 x 20 x 3 = 0.18 pH

pH meters that incorporate Automatic Temperature Compensation (ATC) are able to overcome this error.

Q: So why does my pH 10.00 buffer read as 10.06? A: ATC or not, temperature influences the pH of all solutions. While pH 10.00 buffer is certified to 10.00 at 25 ºC / 77 ºF, at 20 ºC / 68 ºF which is often room temperature, it is actually 10.06.

To understand the pH/temperature relationship, we need to look at two main processes; Calibration & Measurement.

Calibration: Meters have a buffer/temperature look-up table stored into memory for every pH buffer that the meter can calibrate to. For example, when calibrating with a pH 10 buffer that is 20 ºC, the meter knows to calibrate to a value of 10.06 when calibration is performed. Had the temperature of the buffer been 25 ºC, the meter would calibrate instead to 10.00. Using a temperature probe during calibration allows best accuracy as the meter is able to calibrate to the most appropriate pH value.

Measurement: As temperature changes, the pH electrode responds slightly differently. Since this change is predictable, the meter is able to make the appropriate adjustment. The meter senses the temperature and applies the appropriate electrode slope (mV per pH unit) for that temperature. For example, if the temp is 25 ºC, the instrument uses 59.16 mV for each pH unit. If the temperature is 20 ºC, the meter uses 58.16 mV for each pH unit. Using a temperature probe during measurement allows best accuracy as the meter is able to correct for changes in electrode response due to temperature. Note: Temperature compensation only corrects for the change in the output of the electrode, not for the change in the actual solution pH. As such, the AB15 will always display the actual pH of the solution at the current temperature.

38

pH Standardization BuffersBuffers – solutions of known pH value – allow adjustments to the meter/electrode system to reflect accurate measurements. Certified accurate buffers are available as ready-to-use color coded solutions, concentrated solutions, capsules and prepackaged salts. All have the special characteristic of resisting pH change upon dilution or acid/base contamination. For best accuracy, use a minimum of two-point standardization; first with a buffer value close to the electrode system’s zero potential (typically pH 7); and next with an acid or base buffer whose value brackets the expected pH value of the sample. Microprocessor-based meters may permit additional calibrations – up to five points in some models. For best accuracy, perform calibration with ATC at the same temperature as the expected samples.

ORP MeasurementOxidation-Reduction Potential (ORP) or “Redox” measurements are used to monitor chemical reactions, to quantify ion activity, or to determine the oxidizing or reducing properties of a solution. ORP is a measurement of the total electrical potential of a solution – a sum of all oxidation and reduction reactions.

ORP electrodes measure the voltage across a circuit formed by the measuring metal half cell and the reference half cell. When the ORP electrode is placed in the presence of oxidizing or reducing agents, electrons are constantly transferred back and forth on its measuring surface, generating a tiny voltage. ORP is expressed as +/- mV, and can be measured by using the millivolt mode of any pH meter with an ORP electrode.

Like pH, an ORP electrode system consists of a sensing and reference electrodes. For ORP, the indicating electrode is metallic – usually platinum, gold, or silver.

ORP varies with temperature, but unlike pH, it is not completely predictable and therefore, ATC is not used. Constant temperature is best for monitoring ORP.

In principle, ORP measurements should not require standardization; in practice however, it may be necessary to check the system against standards of known potential, as described in ASTM Method D 1498.

ORP is also useful in pool water treatment as an indication of sanitation in relation to free chlorine. ORP technology has gained recognition worldwide and is found to be a reliable indicator of bacteriological water quality. The table below illustrates the Kill Time of E.Coli bacteria as a function of ORP value. With a value of 600 mV, the life of the bacteria is almost 2 minutes; at 650 mV it reduces to 30 seconds. Above 700 mV the bacteria is killed within a few seconds. It is therefore necessary for the water to have an ORP value of at least 700 mV to ensure good water quality.

ORP value also depends on the pH of pool water. The pH of the pool water has to be maintained at the optimum level between 7.2 and 7.6 pH by dosing appropriate chemicals. If the pH of the swimming pool water is acceptable and the ORP value is below 700 mV, hypochlorite or other oxidizing chemicals should be added.

Common ORP applications include the treatment of industrial wastes, study of biological systems, oxidation of cyanide, bleaching of pulp, manufacture of bleach and reduction of chromate wastes.

ISE MeasurementIon-Selective Electrodes (ISE) respond to a particular ion in solution because of the characteristics of the electrode’s sensing membrane. Ideally, the ISE develops an electrical potential which is proportional to the concentration of the ion for which the membrane is selective. The most widely-used ISE is the glass-membrane pH electrode (selective for hydrogen ion).

When an ISE – the indicator electrode – and a reference electrode are placed in a solution and connected to a pH/ion meter, they form a potentiometric cell. At equilibrium, the meter measures the potential difference between the ISE and the reference electrode. This potential is proportional to the activity of the ion of interest.

The table below gives theoretical slope values at 25 ºC:

Although ISE’s are most often measured by direct analysis, some sample preparation is required. Normally, an ionic strength adjuster must be added equally to samples and standards. Then, standards must be prepared which are used to calibrate the meter, or to construct a calibration curve (by plotting the electrode’s output in mV vs. the log of concentration). Sample concentration can then be read directly from the meter or calibration curve.

Incremental methods can reduce errors caused by temperature variations, complex matrices, and complexation. They’re also useful for applications where only occasional samples are analyzed. Incremental methods include: 1) Known Addition; 2) Known Subtraction; 3) Analate Addition; and 4) Analate Subtraction.

Ion-selective electrodes can also be used to detect the endpoint of a titration. The ISE can be selected to monitor either the addition of titrant or the depletion of analate. The electrode potential is plotted vs. the volume of titrant added. The volume corresponding to the equivalence point is determined from the graph, and used to calculate sample concentration.

A number of metallic electrodes are also used in titrations. Dual platinum wire and plate electrodes, are used with pH meters and titration instruments in dead-stop and amperometric titrations; and silver billet electrodes are the choice for silver and halide titrations.

The ion meter/electrode system must be standardized by immersing the electrodes into solutions having a known concentration of the ion of interest. Stock ISE standards are available in a variety of molar, ppm, and percent concentrations. Calibration is typically done using at least two points that are 10 fold apart, such as 1 and 10 ppm. An ionic strength adjuster is required to eliminate interference from other ions. Since some ISE’s have a restricted pH range, a pH adjustment solution may also be necessary. Other special reagents and solutions are available for specific applications.

��

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Species Slope (mV/Decade)Monovalent Cation +59.16Monovalent Anion -59.16Divalent Cation +29.58Divalent Anion -29.58

39

Prevent Problems From Happening And Recognize When It’s Too Late

Testing/Care/Troubleshooting

pH Electrode OffsetA perfect pH electrode under ideal conditions, when placed in pH 7.00 buffer at 25 ºC, will produce 0 mV. The difference between 0 mV and the electrode’s actual mV reading is called the offset error, which usually becomes problematic when it is more than ±30 mV or about ½ of a pH unit.

pH Electrode SlopeA perfect pH electrode under ideal conditions at 25 ºC, produces a slope of 59.16 mV per pH unit. For example, an electrode with 0 mV offset should read mV value of 177.48 mV when placed in a pH 4.01 solution. The slope is calculated as (177.48 mV – 0 mV) / 3 pH = 59.16 mV/pH. The difference between this perfect slope reading and the electrode’s actual reading is called the slope error. These theoretical values are not always achieved, even with brand new electrodes. The slope of most new pH electrodes should fall between 92 % and 102 % of 59.16 mV.

Normal AgingAs electrodes are used or stored for long periods they can undergo changes in performance. The electrode offset and slope can be monitored to evaluate these changes. Periodic calibration is usually adequate to correct for these changes. If an electrode is able to be calibrated and reads accurately in certified standards, is stable, is responsive and repeatable, it is still considered functional and may be used indefinitely although it no longer meets “new” electrode specifications with regards to offset or slope.

How to check your pH electrode – including slope and offset:1. Clear/reset any existing calibration stored in your meter then select the

millivolt (mV) mode of your pH meter

2. Using a pH electrode, obtain mV readings of two fresh calibration buffers (i.e. pH 4.0 and pH 7.0 are best)

3. Determine the net mV change

4. Determine the net mV change per pH unit change and compare using the chart below. For example, at 25 ºC: pH 4 = 170.5 mV, pH 7 = -3.4 mV: Net change = 170.5 mV - (-3.4 mV) = 173.9 mV. Since pH 4 and pH 7 are 3 pH units apart, using the chart below, 98 % = Very Good

5. The offset can be determined by observing the mV reading with your pH electrode in pH 7 buffer. The closer to 0 mV the better. A mV more than 30 mV from 0 may be problematic.

6. Also take notice of the electrode response time – the faster, the better. Don’t expect an economy gel electrode to respond as fast as a high performance glass refillable electrode, but note that a great slope alone is not meaningful if the electrode takes 2 hours to stabilize.

Common Symptoms/Cause (Remedy)• No Response, All Buffers Or Samples Read The Same pH –

Usually pH 7.00 Or 0 mV Broken sensing bulb or wiring problem (replace electrode), probe not

connected to input (verify correct channel selection when using multiple-channel meters), probe is not in contact with sample (remove electrode storage bottle or rubber bulb guard), meter automatically has frozen reading (verify that the hold feature or auto read feature is set to off when using meters with this feature, usually by pressing measure or read.)

• Slow Response With Excessive Crystallization Inside Probe Of Refillable Electrodes

Electrolyte flow clogged from supersaturated electrolyte (“flush & fill” by remove the filling solution through the fill hole with a syringe or by shaking it upside down. Repeatedly flush and rinse the reference cavity with clean, 60-80 ºC water to dissolve crystals until removed. Replace filling solution and apply gentle pressure to the filling hole. Re-hydrate electrode in storage solution or pH 4 buffer), (ensure fill hole is in open position). To prevent this in the future, ensure that the re-fill hole is closed when electrode is not in use.

• Slow Response Due To Clogged Junction-Usually With Single-Junction Electrodes

Reaction with silver such as silver sulfide formation or protein deposits which causes a dark spot on the ceramic reference junction (For protein layers prepare a 1 % pepsin solution in 0.1 M of HCl and soak the reference junction for one hour in this solution. Rinse the electrode with distilled water. Alternatively, heat a diluted KCl solution to 60 to 80 ºC. Place the sensing part of the electrode into the heated solution for about 10 minutes. Allow the electrode to cool in some unheated KCl solution.

• Dried Salt Deposits Present Electrolyte residue deposited on electrode surface – often with new

electrodes or periods of non-use. (simply dissolve the deposits in warm tap water followed by a brief soak in pH 4 buffer).

SlopeAt 20 ºC At 25 ºC

Status1 pH Unit 3 pH Units 1 pH Unit 3 pH Units

>102 >59.3 >178.0 >60.3 >181.0 Poor

102 % 59.3 178.0 60.3 181.0 Ok

101 % 58.8 176.3 59.8 179.3 Very Good

100 % 58.2 174.5 59.2 177.5 Ideal

99 % 57.6 172.8 58.6 175.7 Very Good

98 % 57.0 171.0 58.0 173.9 Very Good

97 % 56.4 169.3 57.4 172.2 Very Good

96 % 55.8 167.5 56.8 170.4 Very Good

95 % 55.3 165.8 56.2 168.6 Very Good

94 % 57.0 171.0 58.0 173.9 Ok

93 % 54.1 162.3 55.0 165.1 Ok

92 % 53.5 160.5 54.4 163.3 Ok

<92 <53.5 <160.5 <54.4 <163.3 Poor

In theory under perfect conditions, an ideal electrode has the following properties:

Offset = 0 mV Slope = 59.16 mV/pH @ 25 °C

mV

pH

0

7

ISO Potential Point

40

• Slow Response, Noisy, Unstable, Or Erratic Readings Sensing bulb dry or dirty (clean electrode with mild detergent & warm water

and re-hydrate electrode), temperature may be changing rapidly or electrode may be thermally shocked (allow electrode to reach sample temperature), sample may be non-aqueous (take 30 second readings and soak in pH buffer for one minute between measurements).

For additional support contact your Fisher Scientific sales or customer service representative, call a electrochemistry specialist at 1-888-358-4706, or send an email to: [email protected]

General Rules And Tips• When using refillable electrodes, open the fill hole during calibration and

measurement – but remember to close it afterwards when finished!

• The level of electrolyte in the outer cavity of refillable electrodes should be kept above the level of the solution being measured to prevent reverse electrolyte flow.

• The electrode need only be immersed far enough to cover both the glass pH sensing bulb and reference junction to obtain accurate readings.

• Electrodes perform best when they are hydrated. However, if they dry out they can be reconditioned to normal performance again. Soaking in electrode storage solution helps to optimize and re-establish the thin hydration layer on the sensing bulb that is critical to pH measurement.

• Rinsing the electrode with deionized or distilled water between samples is fine, but storage in deionized or distilled can be detrimental as it will rob critical ions from the sensing bulb. Also, avoid wiping or touching the sensing bulb to maintain the hydration layer and producing any electrical charge.

• Moving or touching the electrode cable may result in unstable readings due to the high impedance (resistance) of the pH glass membrane and introduce noise.

• To eliminate temperature errors associated with the electrode, manual or automatic temperature compensation (ATC) should be used for best accuracy. Since temperature changes pH, the sample temperature should always be noted with pH readings. i.e.) Record results as “pH 8.43 @ 23.2 ºC”, instead of “pH 8.43”.

• Always use fresh pH buffers for calibration. Excessive air exposure and sunlight an alter the buffers value – especially pH 10.00 buffers which is particularly susceptible to drift.

The common BNC connector is an

abbreviation for Bayonet Neill-Concelman, named

after its inventors.

41

Resistivity, Conductivity, and Salinity UnitsThe basic unit of conductivity is the Siemens (S), formerly called the mho. Since cell geometry affects conductivity values, standardized measurements are expressed in specific conductivity units (S/cm) to compensate for variations in electrode dimensions. Specific conductivity (C) is simply the product of measured conductivity (G) and the electrode cell constant (L/A), where L is the length of the column of liquid between the electrode and A is the area of the electrodes.

C = G x (L/A)

Resistivity is simply the reciprocal of conductivity: conductivity = 1/resistivity. In practice, resistivity units are used when describing ultra pure water such as deionized or reverse-osmosis water. Conductivity units are used for water ranging from drinking water to brackish water. Salinity units are reserved for the highest concentrations expressed as parts per thousand (ppt) or more commonly % concentrations of salt, such as 3.5 % sea water.

Total Suspended Solids (TSS) and Total Dissolved Solids (TDS)Suspended Solids measurements are traditionally determined by filtering a measured volume of water – usually 1 liter. Solids captured by a filter are deemed “suspended solids”. The water that passes thru (filtrate) is oven dried and the residue that remains is called “dissolved solids”. Both are usually measured as mg/L or ppm. Unfortunately, drying of the filtrate to complete evaporation is a long process and requires heating. TDS (conductivity multiplied by a TDS factor) can be used as a quick, inexpensive alternative method. TDS as measured with a conductivity meter will correspond to the dissolved ionic content that is often a useful approximation for the total dissolved material.

There are limitations when using TDS. First, a TDS factor used is salt specific so if there are multiple or unknown salts in solution, it’s nearly impossible to determine the ideal factor to use. Second, since ionic concentrations are not linear, the TDS factor changes with concentration. Also, TDS is not preferred for low measurements.

Electrical Conductivity (EC) meters measure the capacity of ions in an aqueous solution to carry electrical current. As the ranges in aqueous solutions are usually small, the basic units of measurements are milliSiemens/cm (mS) and microSiemens/cm (μS).

Conductivity MeasurementThe principle by which instruments measure conductivity is simple – two plates are placed in the sample, a potential is applied across the plates, and the current is measured. Conductivity (G), the inverse of Resistivity (R) is determined from the voltage and current values according to Ohm’s law.

G = I/R = I (amps) / E (volts)

Since the charge on ions in solution facilitates the conductance of electrical current, the conductivity of a solution is proportional to its ion concentration. However, conductivity may not correlate directly to concentration. The graphs below illustrate the relationship between conductivity and ion concentration for two common solutions. Notice that the graph is linear for sodium chloride solution, but not for highly concentrated sulfuric acid.

Solution Conductivity

Absolute Pure Water 0.055 µS

Power Plant Boiler Water 1.0 µS

Good City Water 50 µS

Ocean Water 53 mS

Distilled Water 0.5 µS

Deionized Water 0.1 - 10 µS

Drinking Water 0.1 - 1 mS

Wastewater 0.9 - 9 mS

Seawater 53 mS

10 % NaOH 355 mS

10 % H2SO4 432 mS

31 % HNO3 865 mS


About Conductivity Measurement

Figure 1

Conductivity Resistivity

0.01 µS 100 MΩ

0.055 µS 18.0 MΩ

0.1 µS 10 MΩ

1 µS 1 MΩ

10 µS 0.1 MΩ

100 µS 0.01 MΩ

1 mS 1 kΩ

42

Temperature Compensation and CoefficientConductivity is greatly influenced by temperature. Most fluids increase in conductivity as temperature increases. Most ionic solutions will increase about 2 % for each 1 ºC increase. Unfortunately, this temperature coefficient (TC) is not always. In the case of high resistance water it can be closer to 5 % or so per ºC.

Many instruments adjust the conductivity value based on a TC and display a value that is said to be corrected or normalized to 25 ºC. The meter will automatically make corrections to the reading and display a value as if the sample was 25 ºC, no matter what the actual temperature is. Some instruments use a fixed TC of 2.0 % per ºC. Let us consider a meter that uses 2.0 % TC to measure a 1413 µS standard at 25 ºC (77 ºF). If the standard is warmed to 30 ºC (86 ºF), the meter applies a correction of 5 degrees x 0.02 % x 1413 µS = 141.3. Without correction (0.0 % TC) the actual value of a 1413 µS standard of KCl at 30 ºC (86 ºF) is 1548 µS. As the meter corrects for temperature, it displays a value of 1548 µS minus 141.3 µS = 1407 µS. When the sample cools to 25 ºC, it will again read 1413 µS as no correction is applied. Although conductivity cell response is immediate, temperature corrected values will fluctuate as the temperature measurement stabilizes. Advanced meters offer adjustable TC’s, usually from 0.0 % to as much as 10 % per ºC.

Calibration and MaintenanceConductivity systems should be calibrated to certified solution standards before using. When selecting a standard, choose one that has the approximate conductivity of the solution to be measured. Unlike pH, conductivity cells generally change less over time and therefore do not require as frequent calibration.

A polarized or fouled electrode must be cleaned to renew the active surface of the cell. In most situations, hot water with a mild liquid detergent is an effective cleanser. Alcohol easily cleans most organic matter, and chlorine solutions will remove algae, bacteria or molds. To prevent cell damage, abrasives or sharp objects should not be used to clean an electrode. A cotton swab works well for cleaning but care must be taken not to widen the distance of cell.

2-Cell Vs. 4-CellMost conductivity meters use a 2-cell electrode. The electrode surface is usually platinum, titanium, gold-plated nickel, or graphite. The 4-cell electrode is more expensive and uses a reference voltage to compensate for any polarization or fouling of the electrode plates. The reference voltage ensures that measurements indicate actual conductivity independent of electrode condition, resulting in higher accuracy.

Both table salt and sugar dissolve easily in water. However, since

sugar molecules don’t dissociate there is no charge and they can’t

be detected with an electrical conductivity/TDS meter.

Advanced Meter Features To Consider• Adjustable TDS Conversion Factor

When a solution does not have a similar ionic content to natural water, the ability to adjust the TDS conversion factor will enable improved accuracy.

• Adjustable Temperature Coefficients Allows for the precise manipulation of the temperature compensation levels for improved results at various temperatures.

• Multiple Cell Constants Allows use of additional electrodes for best results – usually low or

high ranges.

2-cell electrode

4-cell electrode

43

What is Dissolved Oxygen?Dissolved Oxygen (DO) is a measure of the amount of dissolved gaseous oxygen in a solution. Some gases, such as ammonia, carbon dioxide and hydrogen chloride, react chemically with water to form new compounds. However, gases such as nitrogen and oxygen merely dissolve in water without chemically reacting with it, and exist as microscopic bubbles between water molecules.

There are two main ways in which dissolved oxygen occurs naturally in water: From the surrounding atmosphere, where oxygen in the surrounding air dissolves readily when mixed into water, up to saturation, during water movements; Via photosynthesis when oxygen is produced by aquatic plants and algae as a by-product of photosynthesis. The amount of oxygen dissolved in water is usually measured in percent saturation, or expressed as a concentration in milligrams per litre water. Accurate measurement of dissolved oxygen is essential in processes where oxygen content affects reaction rates, process efficiency or environmental conditions, such as biological wastewater treatment, wine production, bio-reactions, environmental water testing.

Basic Principle in DO MeasurementIn theory, the amount of DO in a solution is dependent on three factors, namely temperature, salinity and atmospheric pressure.

1. Water Temperature Solubility of oxygen reduces as temperature increases. Hence, the colder

the water, the more dissolved oxygen it contains. Since temperature affects both the solubility and diffusion rate of oxygen, temperature compensation is necessary for any standardized DO measurements.

2. Salinity The amount of dissolved oxygen increases as salinity level decreases.

In other words, freshwater holds more oxygen than saltwater. Since the presence of dissolved salts limits the amount of oxygen that can dissolve in water, the relationship between the partial pressure and concentration of oxygen varies with the salinity of the sample.

3. Atmospheric Pressure There is a direct proportional relationship between the solubility of

dissolved oxygen and the surrounding atmospheric pressure. As pressure decreases with increase in altitude, the amount of dissolved oxygen found in water reduces.

To ensure that your dissolved oxygen is not affected by atmospheric pressure, most instruments include barometric pressure compensation. Advanced meters include a built in barometer that measures and adjusts automatically. However, basic meters will make adjustments only after the user inputs the appropriate pressure manually. Atmospheric pressure correction charts included in with certain instrument manuals are also a helpful reference.

DO Electrodes

The measurement of DO requires a special DO electrode that is made up of an anode, a cathode, electrolyte solution and a gas permeable membrane. The material of the membrane is specially selected to permit oxygen to pass through. Oxygen is consumed by the cathode which will create a partial pressure across the membrane. Oxygen then diffuses into the electrolyte solution. In short, a DO meter actually measures the pressure caused by movements of oxygen molecules in water or any other medium. The higher the partial pressure of the oxygen in solution, the higher the oxygen concentration. Currently, galvanic and polarographic electrodes are the predominant methods for measuring dissolved oxygen.

The Galvanic Cell consists of two metals, the positive anode and the negative cathode, connected by a salt bridge between the individual half-cells. As the metal electrodes leave electrons behind as they dissolve in the electrolyte. The different properties of the two metals causes them to dissolve at different rates, hence a potential is created when the number of electrons in either side of the cell differs. The potential is translated into an electric current proportion to the oxygen concentration in the electrolyte if an electrical circuit is created between the two electrodes. The galvanic electrode does not need polarising time and is able to assume operation immediately.

During this process, ions of the more active anode are transferred through the electrolyte to the less active cathode, and deposited there as a plating. In this way the anode is corroded. When the anode material eventually corrodes away, the potential drops and the current halts.

The Polarographic Cell consists of two electrodes placed in the electrolyte: One with fixed potential called the reference electrode, and the other with a variable potential called the polarizable electrode. As voltage is applied to the polarizable electrode, a redox reaction occurs, where electrons break away from the electrode to bond with oxygen in the electrolyte. The rate at which the electrons break away from the polarizable electrode is linearly proportionate to the amount of oxygen available in the electrolyte, hence this movement of electrons is representative of the amount of dissolved oxygen left in the electrolyte.

The advantage of a polarographic cell is that the cathode remains intact. The current flow of the polarographic cell is also linearly proportional to the amount of oxygen present in the electrolyte, enabling the cell to provide highly accurate measurements at low oxygen levels.


About Dissolved Oxygen Measurement

44

BOD & CODThe BOD test measures the molecular oxygen utilized in the biodegradation of organic material and the oxidation of inorganic material. By measuring the amount of oxygen dissolved in samples at the beginning and end of a specified incubation period, the relative oxygen requirements of wastewaters, effluents, and polluted waters can be determined.

BODt (mg/L) = D1 - D2 P

BODt = Oxygen uptake during incubation period t

D1 = DO of diluted sample immediately after preparation (mg/L)

D2 = DO of diluted sample after incubation period t (mg/L)

P = Decimal volumetric fraction of sample used

BOD is similar to the Chemical Oxygen Demand (COD), which also measures relative oxygen-depletion. However, the possible presence of non-biologically oxidizable may render the COD test to be less accurate.

The COD test is often used to measure the amount of organic compounds in water by measuring the amount of oxygen required to oxidize and break down an organic compound into carbon dioxide, ammonia and water. The basis of the COD test is to determine what can be oxidized into carbon dioxide using a strong oxidizing agent in acidic environments. A blank sample, created by adding all reagents to distilled water is usually used as a control in COD measurements.

Both the BOD and COD tests are means to measure the relative oxygen-depletion effect of a waste contaminant, and are widely used to monitor pollution levels. The BOD test measures the oxygen demand of biodegradable pollutants whereas the COD test measures the oxygen demand of biogradable pollutants plus the oxygen demand of non-biodegradable oxidizable pollutants.

COD measures everything that can be chemically oxidized and not just the level of biologically active matter that BOD measures. This is especially important to keep in mind when understanding and comparing COD and BOD results that may contain non-biological oxidizable components.

45

Quick Reference To Every Catalog Number In This Handbook!

Index

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13-620-164 3413-620-165 3413-620-166 3413-620-181 2513-620-182A 2513-620-183A 15, 2513-620-185 2513-620-187 25, 2913-620-19 15, 3413-620-195 2413-620-196 2413-620-197 2413-620-20 19, 3413-620-216 3013-620-221 2713-620-223A 2613-620-258 3013-620-259 3013-620-273 3013-620-284 2913-620-285 2613-620-287A 2713-620-288 2713-620-289 2713-620-290 2713-620-291 2613-620-292 2613-620-293 2613-620-294 2913-620-295 2913-620-296 2413-620-297 2413-620-298 2413-620-299A 2713-620-300 2713-620-31C 2813-620-45 3113-620-46 30

13-079-319 3613-300-109 3613-300-110 3613-300-111 3613-300-112 3613-300-113 3613-300-114 3613-300-115 3613-300-116 3613-300-117 3613-300-118 3613-300-119 3613-300-129 3613-300-130 3613-300-131 3613-300-132 3613-300-178 3713-300-180 3713-301-133 3613-620-100 3413-620-101 3413-620-102 3413-620-108A 2713-620-111 27, 2813-620-111T 2813-620-112 2713-620-113 2413-620-114 2413-620-115 3113-620-122 3113-620-123 3113-620-130 2513-620-131 2513-620-132 2513-620-133 2513-620-149 3113-620-16 3413-620-163 34

13-620-488 3513-620-489 3513-620-490 3513-620-498 3513-620-499 3713-620-501 3313-620-503A 12, 14 3313-620-509 12, 14 3313-620-51 2913-620-511 3313-620-512 3313-620-513 3313-620-519 3213-620-52 2913-620-521 3213-620-523 3213-620-525 3213-620-53 3013-620-530A 2613-620-532 3213-620-534 12, 14, 3213-620-536 3213-620-538 3313-620-543 3313-620-545 3313-620-547 3213-620-549 3313-620-551 3313-620-57 3013-620-61 3013-620-62 3013-620-627 12, 14, 3213-620-629 12, 14, 32

13-620-631 15, 26, 2813-620-632 25, 26,13-620-658 3013-620-79 3013-620-81 3113-620-95 2613-620-96 2613-620-AP50A 18, 2913-620-AP52 18, 2913-620-AP53 18, 3413-620-AP54 20, 3413-620-AP55 20, 2913-620-AP56 2113-620-AP61 18, 2913-620-BSP 17, 3513-620-RP 17, 3513-620-SSP 3413-621-701 2813-621-702 2813-621-703 2813-636-100 1813-636-104 15, 3513-636-430 3713-636-AB150 1513-636-AB150A 1513-636-AB150B 1513-636-AB200 1613-636-AB200A 1613-636-AB250 1413-636-AB250A 1413-636-AP110 1813-636-AP110A 1813-636-AP115 1813-636-AP115A 1813-636-AP125 1813-636-AP125A 1813-636-AP71 18

13-636-AP71A 1913-636-AP72 1913-636-AP72A 1913-636-AP74 2113-636-AP74A 2113-636-AP75 2013-636-AP75A 2013-636-AP84 2113-636-AP84A 2113-636-AP85 2013-636-AP85A 2013-636-XL150 1313-636-XL150A 1313-636-XL200 1113-636-XL200A 1113-636-XL250 1213-636-XL250A 1213-636-XL250F 1213-636-XL250N 1213-636-XL500 1013-636-XL500A 1013-636-XL600 913-636-XL600A 913-636-XL600D 913-637-671 17, 3513-637-674 3513-637-681 3513-637-690 15, 3513-637-691 3513-637-692 3513-637-DOADPT 3413-637-DOM 3413-640-8 3613-641-164 3713-641-165 3713-641-166 3713-641-210 3713-641-722 37

13-641-735 3713-641-857 3613-642-145 3713-643-001 3613-643-002 3613-643-003 3613-643-004 3615-094-26 4715-094-27 4715-094-28 4715-094-29 4715-094-30 4715-094-33 4715-094-37 4715-094-44 4715-094-50 4715-094-53 4715-500-034 21, 3415-500-035 3415-500-036 21, 3415-500-037 3415-500-038 3415-500-039 3415-700-341 47AB150ACERT 47AB200ACERT 47AB250ACERT 47SP135-500 37SP138-500 37XL150ACERT 47XL200ACERT 47XL250ACERT 47XL500ACERT 47XL600ACERT 47

Catalog No. Page Catalog No. Page Catalog No. Page Catalog No. Page Catalog No. Page Catalog No. Page

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Specialists In Instrument Calibration Services

InnoCal

Instrument calibration to NIST-traceable standards helps you meet ISO, FDA, USDA, and EPA quality assurance guidelines. Have your Fisher Scientific accumet instrumentation pretested and calibrated before using it in your critical processes.

pH calibration service includes measurement of meter accuracy at five test points across pH range and five test points across corresponding mV range. Testing is performed by our accredited laboratory and an NIST-traceable certificate is provided to document instrument accuracy.

Don’t Leave Accuracy To Chance! Order NIST-Traceable Calibration Versions Of Your Favorite Fisher Scientific accumet Meters

Description Parameter Catalog No.Fisher Scientific accumet AB Meters Meter Only Meter Kit BioBasic Meter KitAB150 with NIST-traceable pH certificate pH, mV, temp AB150ACERT AB150CERT AB150BCERTAB250 with NIST-traceable pH certificate pH, mV, temp, ISE AB250ACERT AB250CERT –AB200 with NIST-traceable pH certificate pH, mV, temp, conductivity AB200ACERT AB200CERT –

Fisher Scientific accumet XL Meters Meter Only Meter Kit Deluxe Meter KitXL150 with NIST-traceable pH certificate pH, mV, temp XL150ACERT XL150CERT –XL200 with NIST-traceable pH certificate pH, mV, temp, conductivity XL200ACERT XL200CERT –XL250 with NIST-traceable pH certificate Dual pH, mV, temp, ISE XL250ACERT XL250CERT –XL500 with NIST-traceable pH certificate Dual pH, mV, temp, ISE, conductivity XL500ACERT XL500CERT –XL600 with NIST-traceable pH certificate Dual pH, mV, temp, ISE, conductivity, DO XL600ACERT XL600CERT XL600DCERT

NIST-Traceable Certificate For Specifications Innocal Cert. No.pH Meter (Benchtop Or Portable) Five test points across pH range and five test points across mV range 17106-20Conductivity/Resistivity Meter (Benchtop Or Portable) One test point in each measuring range 17090-30Dissolved oxygen Meter (Benchtop or Portable) Three test points across range 17106-04Glass Thermometer Two test points across temperature range 17006-03Humidity Three humidity test points and one temperature test point 17030-20Infrared Thermometer Four test points across temperature range 17101-62Pipette/Dispenser Three test points: 25 %, 50 %, and 100 % of range 17104-00Temperature Datalogger Three test points across temperature range 17002-20Temperature (Meter Only) Four test points across temperature range 17101-79Temperature System (Meter + Probe) Four test points across temperature range 17001-10Timer/Stopwatch Ten test points over a 24-hour period 17060-00

InnoCal is a full-service Metrology Laboratory committed to meeting your calibration needs. Additional instrument testing capabilities are listed below. Contact your Fisher Scientific Customer Service Representative for details on additional calibration capabilities not listed here or call 866-466-6225 to speak with an Innocal specialist. For calibration service of an instrument you already have, a return authorization number will be issued.

Benefits: Highest QualityTesting performed by an ISO/IEC 17025 accredited laboratory.

Fast ServiceInstruments serviced in 5 to 7 business days.

Excellent ValueAccuracy verified at multiple test points with “as found” and “as left” test data.

Reliable DocumentationCertificates are packed with valuable information.

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electrochemistry handbook

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